CN106163012B - A kind of constant pressure adjusting control circuit with hysteresis - Google Patents
A kind of constant pressure adjusting control circuit with hysteresis Download PDFInfo
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- CN106163012B CN106163012B CN201610731672.9A CN201610731672A CN106163012B CN 106163012 B CN106163012 B CN 106163012B CN 201610731672 A CN201610731672 A CN 201610731672A CN 106163012 B CN106163012 B CN 106163012B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention relates to a kind of adjusting control circuit, more particularly to a kind of constant pressure adjusting control circuit with hysteresis.Including：Triangular wave generation unit, the reference signal of predetermined waveform is produced according to a first voltage；Adjustment unit is lagged, the voltage of signal one first node of change is adjusted according to an outside；Comparing unit, the adjustable switching drive signal of dutycycle is produced according to the voltage of reference signal and first node, switching drive signal is used for the conducting and shut-off for driving an external loading branch road, when the dutycycle of switching drive signal is less than given threshold, the voltage of the first node is dragged down by lagging adjustment unit.The present invention is by the way that the voltage of first node caused by reference signal and hysteresis adjustment unit is compared, produce the adjustable switching drive signal of dutycycle, and when the dutycycle of switching drive signal is less than given threshold, drag down the voltage of first node, so as to utilize the shut-off for controlling external loading branch road, the stroboscopic of external loading is effectively controlled.
Description
Technical field
The present invention relates to a kind of adjusting control circuit, more particularly to a kind of constant pressure adjusting control circuit with hysteresis.
Background technology
LED is widely used as a kind of energy-conserving light source, and the light adjusting controller of prior art is mostly using controllable
Silicon and potentiometer realize the purpose of light modulation, but in application process, because the dutycycle of the constant pressure provided to LED is very low
When, high frequency LED can be caused to occur stroboscopic in dimming process.
The content of the invention
For above mentioned problem existing for current LED, the present invention provides a kind of constant pressure brightness adjustment control electricity with hysteresis
Road.
The technical proposal for solving the technical problem of the invention is：
A kind of constant pressure adjusting control circuit with hysteresis, including：
Triangular wave generation unit, the reference signal of predetermined waveform is produced according to a first voltage；
Adjustment unit is lagged, the voltage of signal one first node of change is adjusted according to an outside；
Comparing unit, the adjustable switch drive of dutycycle is produced according to the voltage of the reference signal and the first node
Signal, the switching drive signal are used for the conducting and shut-off for driving an external loading branch road；
When the dutycycle of the switching drive signal is less than given threshold, dragged down by the hysteresis adjustment unit described
The voltage of first node.
Preferably, the constant pressure adjusting control circuit with hysteresis also includes：
First power conversion unit, first power conversion unit are described for input terminal voltage decompression to be converted to
First voltage；
Second source converting unit, for input terminal voltage decompression to be converted into a second voltage.
Preferably, the hysteresis adjustment unit includes：
One first diode, it is connected to the first predetermined partial pressure tie point of a first resistor bleeder circuit and the outside tune
Between entire signal, the first resistor bleeder circuit includes predetermined number and is connected in series with each other in the second voltage and institute
The first divider resistance between first node is stated, the point being connected between first divider resistance forms partial pressure tie point.
Preferably, the hysteresis adjustment unit also includes a first comparator,
The in-phase input end of the first comparator is connected by first resistor with the described first predetermined partial pressure tie point；Institute
The inverting input for stating first comparator is connected between the second predetermined partial pressure tie point of a second resistance bleeder circuit, described
Second resistance bleeder circuit includes predetermined quantity and be connected in series with each other between the second voltage and earth terminal second
Divider resistance, the point being connected between second divider resistance form partial pressure tie point；
The output end of the first comparator connects the in-phase input end of the first comparator by a second resistance, and
And the output end of the first comparator connects the first node by a 3rd resistor；
The biased electrical pressure side of the first comparator is connected with the second voltage, the work in the presence of the second voltage
Make, to pass through the outside voltage for adjusting signal and adjusting the output end of the first comparator.
Preferably, the triangular wave generation unit includes one second comparator,
3rd predetermined partial pressure tie point phase of the in-phase input end of second comparator and a 3rd resistor bleeder circuit
Connection, the 3rd resistor bleeder circuit include predetermined number and be connected in series with each other in the first voltage and earth terminal it
Between the 3rd divider resistance, the point being connected between the 3rd divider resistance forms partial pressure tie point；Second comparator
Inverting input be connected with the inverting input of the comparing unit；
The output end of second comparator is connected by the branch road composed in parallel by one the 4th resistance and one first electric capacity
The 3rd predetermined partial pressure tie point；The output end of second comparator also passes through the 5th resistance being connected in series and the second electricity
Appearance is connected to ground, wherein the tie point between the 5th resistance and second electric capacity connects the anti-phase of second comparator
Input；
The bias terminal voltage end of second comparator is connected with the first voltage, for producing the reference signal.
Preferably, first power conversion unit includes：
One first triode, colelctor electrode and the input terminal voltage of first triode couple, the one or three pole
The emitter stage of pipe connects the first voltage；
Zener diode, the negative pole of the Zener diode connect the base stage of first triode, the Zener two
The plus earth of pole pipe；
One the 7th resistance, one end of the 7th resistance are connected to the colelctor electrode of first triode, other end connection
In the negative pole of the Zener diode.
Preferably, the second source converting unit includes：
One second triode, the colelctor electrode of second triode are connected by one the 3rd diode and the input terminal voltage
Connect；
One voltage-regulator diode, the negative pole of the voltage-regulator diode connect the base stage of second triode, the voltage stabilizing two
The plus earth of pole pipe；
One the 8th resistance, it is connected between the colelctor electrode of second triode and the negative pole of the voltage-regulator diode.
Preferably, the given threshold is not more than 5%.
Preferably, the first voltage is 5V, and the second voltage is 10V.
Preferably, the external loading branch road includes：
One switch, is connected between the input terminal voltage and the comparing unit to the switch controls, to pass through
The switching drive signal provides drive signal to the switch, controls the on or off of the switch；
One LED, the LED connect with the switch, to control the LED according to the on or off of the switch
The work of lamp.
Beneficial effects of the present invention：A kind of constant pressure adjusting control circuit with hysteresis of the present invention, by by triangle
The voltage of first node is compared caused by reference signal caused by ripple generation unit and hysteresis adjustment unit, produces dutycycle
Adjustable switching drive signal, and when the dutycycle of switching drive signal is less than given threshold, drag down the electricity of first node
Pressure, so as to utilize the shut-off for controlling external loading branch road, effectively control the frequency of the external loading such as LED or incandescent lamp
Dodge.
Brief description of the drawings
Fig. 1 is a kind of overall construction drawing of constant pressure adjusting control circuit with hysteresis of the present invention；
Fig. 2 is a kind of circuit diagram of embodiment of the present invention.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
In LED or the incandescent lamp course of work, the too low electricity of the dutycycle of the external loadings such as LED one is applied to due to working as
When pressing signal, stroboscopic phenomenon can be produced, in order to solve this problem, invention provides a kind of constant pressure light modulation control with hysteresis
Circuit processed.Specifically as depicted in figs. 1 and 2：
A kind of constant pressure adjusting control circuit with hysteresis, including：
Triangular wave generation unit 1, the reference signal VR of predetermined waveform is produced according to a first voltage VDD1；
Adjustment unit 2 is lagged, one first node LX of signal DIM changes voltage is adjusted according to an outside；
Comparing unit 3, the voltage according to reference signal VR and first node LX produce the adjustable switch drive letter of dutycycle
Number DRIVE, switching drive signal DRIVE are used for the conducting and shut-off for driving an external loading branch road；Work as switching drive signal
When DRIVE dutycycle is less than given threshold, the voltage of the first node LX is dragged down by the hysteresis adjustment unit 2.
In this embodiment, comparing unit 3 is one the 3rd comparator U1B, and the 3rd comparator U1B anti-phase input terminates
Enter reference signal VR, in-phase input end access first node LX voltage.3rd comparator U1B in-phase end is by one by resistance
The branch road that R18 and electric capacity C5 are composed in parallel is connected to ground.Because first node LX voltage is can to adjust list by lagging
It is changed under member 2 and outside adjustment signal DIM collective effect, then can passes through the 3rd comparator on this basis
U1B is compared, to produce the adjustable switching drive signal DRIVE of a dutycycle.When the switch drive for being supplied to external loading
When signal DRIVE dutycycle is less than given threshold, first node LX voltage is dragged down by outside adjustment signal DIM, it is excellent
It by first node LX voltage pull-down is zero that the embodiment of choosing, which is, so that the 3rd comparator U1B output end output is
Low level, so as to which external loading is set to off into closed state, avoid stroboscopic of the external loading when dutycycle is too low.
The preferred embodiment of the present invention, above-mentioned triangular wave generation unit 1 produce the reference signal that a waveform is triangular wave.
The preferred embodiment of the present invention, as shown in Fig. 2 the constant pressure adjusting control circuit with hysteresis also includes：
First power conversion unit, the first power conversion unit are used to input terminal voltage Vin decompressions being converted to first
Voltage VDD1；
Second source converting unit, for input terminal voltage Vin decompressions to be converted into a second voltage VDD2.
In the embodiment, input terminal voltage Vin voltage range is between 12V~30V.Pass through the first power conversion unit
Input terminal voltage Vin decompressions are converted into the first voltage VDD1 that size is 5V, to provide stable work for the second comparator U1A
Make voltage.It is 10V second voltage VDD2 that input terminal voltage Vin decompressions are converted into size by second source converting unit, with
Stable operating voltage is provided for first comparator U2A and the 3rd comparator U1B.Specifically, first voltage VDD1 is derived from electric capacity
The voltage at C3 both ends, second voltage VDD2 are derived from the voltage at electric capacity C2 both ends.
The preferred embodiment of the present invention, hysteresis adjustment unit 2 include：
One first diode D3, it is connected to the first predetermined partial pressure tie point LX11 and the outside of a first resistor bleeder circuit
Between adjusting signal DIM, first resistor bleeder circuit include predetermined number and be connected in series with each other in second voltage VDD2 with
The first divider resistance R4 and R9 between first node LX, the first divider resistance R4 form partial pressure connection with the point being connected between R9
Point.
Specifically, first divider resistance includes the R4 and R9 being connected in series.First diode D3 positive pole is connected to R4
With R9 junction, i.e., at the first predetermined partial pressure tie point LX11.Outside adjustment signal is drawn from the first diode D3 negative pole
DIM.Resistance R4 other end connection second voltage VDD2.The 3rd comparator U1B in-phase input end connection R9 other end, instead
Phase input is derived from reference signal VR caused by triangular wave generation unit 1.
The preferred embodiment of the present invention, given threshold are not more than 5%.
The preferred embodiment of the present invention, hysteresis adjustment unit 2 also include first comparator U2A,
First comparator U2A in-phase input end is connected by first resistor R6 with the first predetermined partial pressure tie point LX11；
First comparator U2A inverting input be connected to a second resistance bleeder circuit the second predetermined partial pressure tie point LX12 it
Between, second resistance bleeder circuit includes predetermined quantity and be connected in series with each other between second voltage VDD2 and earth terminal the
The point being connected between two divider resistance R7 and R16, the second divider resistance R7 and R16 forms partial pressure tie point；
First comparator U2A output end by the in-phase input end of a second resistance R8 connection first comparators U2A, and
And first comparator U2A output end passes through a 3rd resistor R11 connection first nodes LX；
First comparator U2A biased electrical pressure side is connected with second voltage VDD2, the work in the presence of second voltage VDD2
Make, to pass through the outside voltage for adjusting signal DIM and adjusting the output end of the first comparator U2A.
Specifically, second divider resistance includes the R7 and R16 being connected in series.Parallel connection one is filtered by second divider resistance
Ripple electric capacity C2.A R7 termination second voltage VDD2, other end connection R16, meanwhile, not being connected with resistance R7 for R16 is another
End ground connection.The second predetermined partial pressure tie point LX12 that R7 and R16 coupling parts are formed, the second predetermined partial pressure tie point LX12 connect
Connect comparator U2A inverting input.Feedback resistance R8 is connected between first comparator U2A in-phase end and output end.First
Comparator U2A output end is connected a resistance R11, the resistance R11 other end in-phase end and electricity with the 3rd comparator U1B respectively
Hinder R10 connections, and R10 other end connection second voltage VDD2.When the electricity for the in-phase end for needing to drag down the 3rd comparator U1B
During pressure, by the size for adjusting outside adjustment signal DIM so that in being total to for outside adjustment signal DIM and the first diode D3
The voltage for being conveyed to first comparator U2A in-phase ends is dragged down under same-action, and the voltage of first comparator U2A end of oppisite phase is substantially not
Become, therefore, as long as when the voltage Tiao Jiedao of first comparator U2A in-phase ends is less than the voltage of end of oppisite phase, first comparator U2A
Can exports low level signal, so as to further drag down the voltage signal for being conveyed to the 3rd comparator U1B in-phase ends, is
The dutycycle for adjusting the 3rd comparator U1B provides the comparison signal of a change.
The preferred embodiment of the present invention, triangular wave generation unit 1 include one second comparator U1A,
3rd predetermined partial pressure tie point LX13 of the second comparator U1A in-phase input end and a 3rd resistor bleeder circuit
It is connected, 3rd resistor bleeder circuit includes predetermined number and is connected in series with each other between first voltage VDD1 and earth terminal
The 3rd divider resistance R2 and R17, the point being connected between the 3rd divider resistance R2 and R17 forms partial pressure tie point；Second ratio
Inverting input compared with device U1A is connected with the 3rd comparator U1B inverting input；
Second comparator U1A output end is connected by the branch road composed in parallel by one the 4th resistance R3 and one first electric capacity C1
Meet the 3rd predetermined partial pressure tie point LX13；Second comparator U1A output end also passes through the 5th resistance R15 being connected in series and
Two electric capacity C6 are connected to ground, wherein the tie point between the 5th resistance R15 and the second electric capacity C6 connects the anti-of the second comparator U1A
Phase input；
Second comparator U1A biased electrical pressure side is connected with first voltage VDD1, and the second comparator U1A is used to produce
Reference signal VR.
The preferred embodiment of the present invention, the first power conversion unit include：
One first triode Q2, the first triode Q2 colelctor electrode couples with input terminal voltage Vin, the first triode Q2's
Emitter stage is connected with first voltage VDD1；
Zener diode U3, Zener diode U3 negative pole connect the first triode Q2 base stage, Zener diode U3
Plus earth；
One the 7th resistance R14, the 7th resistance R14 one end are connected to the first triode Q2 colelctor electrode, other end connection
In Zener diode U3 negative pole.
Specifically, Zener diode U3 is connected to the 4th predetermined partial pressure tie point LX14 of one the 4th resistor voltage divider circuit,
4th resistor voltage divider circuit includes predetermined number and the 4th partial pressure being connected in series with each other between first voltage and earth terminal
The point being connected between resistance R13 and R19, the 4th divider resistance R13 and R19 forms partial pressure tie point.In the first triode Q2
Colelctor electrode be connected in series resistance R1 and one second diode D2, and diode D2 positive pole connection input terminal voltage Vin is born
Pole connection resistance R1.One electric capacity C4 is connected between the second diode D2 negative pole and earth terminal.One electric capacity C3 is connected to first
Between voltage VDD1 and earth terminal.
Embodiments of the invention, it is to draw Liang Tiaozhi roads from input terminal voltage Vin, a branch road is used to produce for triangular wave
Unit 1 provides stable power supply, and another branch road provides stable power supply for hysteresis adjustment unit 2.Therefore, first power supply turns
Unit is changed by the element such as triode Q2 and voltage-regulator diode U3, stable power supply is provided for the second comparator U1A.
The preferred embodiment of the present invention, second source converting unit include：
One second triode Q1, the second triode Q1 colelctor electrode passes through one the 3rd diode D1 and input terminal voltage Vin
Connection；
One voltage-regulator diode D4, voltage-regulator diode D4 negative pole connect the second triode Q1 base stage, voltage-regulator diode D4
Plus earth；
One the 8th resistance R5, it is connected between the second triode Q1 colelctor electrode and the negative pole of voltage-regulator diode.
Similar with the first power conversion unit, the second source converting unit compares for first in hysteresis adjustment unit 2
The stable voltage of the offers such as device U2A.One electric capacity C2 is connected between the second triode Q1 emitter stage and earth terminal, its both ends
Voltage is as second voltage VDD2.
The preferred embodiment of the present invention, as shown in figure 1, external loading branch road includes：
One switch 5, switch 5 are controllably connected between input terminal voltage Vin and comparing unit 3, to be driven by switching
Dynamic signal DRIVE provides drive signal to switch 5, controls the on or off of the switch 5；
One LED 4, LED 4 are connected with switch 5, to control the work of LED 4 according to the on or off of switch 5.
In this embodiment, the LED 4 in external loading branch road is used as connection bridge by switch 5, with the 3rd comparator
U1B output end electrical connection.Specifically, constant pressure light adjusting circuit of the invention, will under outside adjustment signal DIM control adjustment
The adjustable switching drive signal DRIVE of dutycycle is sent to switch 5 caused by 3rd comparator U1B output ends, when the closure of switch 5
When, switching drive signal DRIVE drives LED 4 bright, and its brightness is relevant with switching drive signal DRIVE dutycycle；It is no
Then, when switching 5 disconnection, LED 4 does not work.In this embodiment, switch 5 can use electronic switching tube.
Preferred embodiments of the present invention are these are only, not thereby limit embodiments of the present invention and protection domain, it is right
For those skilled in the art, it should can appreciate that and all be replaced with being equal of being made of description of the invention and diagramatic content
Change and obviously change resulting scheme, should be included in protection scope of the present invention.
Claims (10)
- A kind of 1. constant pressure adjusting control circuit with hysteresis, it is characterised in that including：Triangular wave generation unit (1), the reference signal (VR) of predetermined waveform is produced according to a first voltage (VDD1)；Adjustment unit (2) is lagged, the voltage of signal (DIM) one first node of change (LX) is adjusted according to an outside；Comparing unit (3), it is adjustable to produce dutycycle according to the voltage of the reference signal (VR) and the first node (LX) Switching drive signal (DRIVE), the switching drive signal (DRIVE) are used for conducting and the pass for driving an external loading branch road It is disconnected；When the dutycycle of the switching drive signal (DRIVE) is less than given threshold, drawn by the hysteresis adjustment unit (2) The voltage of the low first node (LX).
- 2. the constant pressure adjusting control circuit according to claim 1 with hysteresis, it is characterised in that also include：First power conversion unit, first power conversion unit are used to an input terminal voltage (Vin) decompression being converted to institute State first voltage (VDD1)；Second source converting unit, for the input terminal voltage (Vin) decompression to be converted into a second voltage (VDD2).
- 3. the constant pressure adjusting control circuit according to claim 2 with hysteresis, it is characterised in that the hysteresis regulation Unit (2) includes：One first diode (D3), be connected to the first predetermined partial pressure tie point (LX11) of a first resistor bleeder circuit with it is described Between outside adjustment signal (DIM), the first resistor bleeder circuit includes predetermined number and is connected in series with each other in described The first divider resistance (R4, R9) between second voltage (VDD2) and the first node (LX), first divider resistance The point being connected between (R4, R9) forms partial pressure tie point.
- 4. the constant pressure adjusting control circuit according to claim 3 with hysteresis, it is characterised in that the hysteresis regulation Unit (2) also includes a first comparator (U2A),The in-phase input end of the first comparator (U2A) passes through first resistor (R6) and the described first predetermined partial pressure tie point (LX11) connect；It is second predetermined to be connected to a second resistance bleeder circuit for the inverting input of the first comparator (U2A) Between partial pressure tie point (LX12), the second resistance bleeder circuit includes predetermined quantity and is connected in series with each other in described the Second divider resistance (R7, R16) of two voltages (VDD2) between earth terminal, it is connected between second divider resistance (R7, R16) The point connect forms partial pressure tie point；The output end of the first comparator (U2A) connects the same of the first comparator (U2A) by a second resistance (R8) Phase input, and the output end of the first comparator (U2A) connects the first node by a 3rd resistor (R11) (LX)；The biased electrical pressure side of the first comparator (U2A) is connected with the second voltage (VDD2), in the second voltage (VDD2) worked in the presence of, to pass through the outside output end for adjusting signal (DIM) and adjusting the first comparator (U2A) Voltage.
- 5. the constant pressure adjusting control circuit according to claim 1 with hysteresis, it is characterised in that the triangular wave production Raw unit (1) includes one second comparator (U1A),The in-phase input end of second comparator (U1A) and the 3rd predetermined partial pressure tie point of a 3rd resistor bleeder circuit (LX13) it is connected, the 3rd resistor bleeder circuit includes predetermined number and is connected in series with each other in the first voltage (VDD1) the 3rd divider resistance (R2, R17) between earth terminal, the point being connected between the 3rd divider resistance are formed minute Press tie point；The inverting input of second comparator (U1A) is connected with an inverting input of the comparing unit (3)；The output end of second comparator (U1A) is by being composed in parallel by one the 4th resistance (R3) and one first electric capacity (C1) Branch road connects the 3rd predetermined partial pressure tie point (LX13)；The output end of second comparator (U1A) also passes through the company of series connection The 5th resistance (R15) and the second electric capacity (C6) connect is connected to ground, wherein the 5th resistance (R15) and second electric capacity (C6) tie point between connects the inverting input of second comparator (U1A)；The bias terminal voltage end of second comparator (U1A) is connected with the first voltage (VDD1), for producing the ginseng Examine signal (VR).
- 6. the constant pressure adjusting control circuit according to claim 2 with hysteresis, it is characterised in that first power supply Converting unit includes：One first triode (Q2), colelctor electrode and the input terminal voltage (Vin) of first triode (Q2) couple, described The emitter stage of first triode (Q2) connects the first voltage (VDD1)；Zener diode (U3), the negative pole of the Zener diode (U3) connect the base stage of first triode (Q2), institute State Zener diode (U3) plus earth；One the 7th resistance (R14), one end of the 7th resistance (R14) are connected to the colelctor electrode of first triode (Q2), The other end is connected to the Zener diode (U3) negative pole.
- 7. the constant pressure adjusting control circuit according to claim 2 with hysteresis, it is characterised in that the second source Converting unit includes：One second triode (Q1), the colelctor electrode of second triode (Q1) pass through one the 3rd diode (D1) and the input Terminal voltage (Vin) connects；One voltage-regulator diode (D4), the negative pole of the voltage-regulator diode (D4) connect the base stage of second triode (Q1), institute State voltage-regulator diode (D4) plus earth；One the 8th resistance (R5), be connected to second triode (Q1) colelctor electrode and the voltage-regulator diode negative pole it Between.
- 8. the constant pressure adjusting control circuit according to claim 4 with hysteresis, it is characterised in that the given threshold No more than 5%.
- 9. the constant pressure adjusting control circuit according to claim 2 with hysteresis, it is characterised in that the first voltage (VDD1) it is 5V, the second voltage (VDD2) is 10V.
- 10. the constant pressure adjusting control circuit according to claim 2 with hysteresis, it is characterised in that bear the outside Carrying branch road includes：One switch (5), the switch (5) be controllably connected to the input terminal voltage (Vin) and the comparing unit (3) it Between, to provide drive signal to the switch (5) by the switching drive signal (DRIVE), control leading for the switch (5) Logical or shut-off；One LED (4), the LED (4) are connected with the switch (5), with the on or off control according to the switch (5) Make the work of the LED (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610731672.9A CN106163012B (en) | 2016-08-26 | 2016-08-26 | A kind of constant pressure adjusting control circuit with hysteresis |
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|---|---|---|---|
| CN201610731672.9A CN106163012B (en) | 2016-08-26 | 2016-08-26 | A kind of constant pressure adjusting control circuit with hysteresis |
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| CN106163012B true CN106163012B (en) | 2018-01-30 |
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| CN107027224B (en) * | 2017-06-09 | 2024-09-13 | 厦门奇力微电子有限公司 | LED dimming circuit and LED driving circuit |
| CN109302765B (en) * | 2017-07-25 | 2023-05-12 | 光电子有限责任公司 | Driving device for lighting device and lighting device |
| CN108449839A (en) * | 2018-04-20 | 2018-08-24 | 深圳市芯飞凌半导体有限公司 | A kind of brightness-adjustable is without stroboscopic LED control circuit, LED illumination device |
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| CN100399689C (en) * | 2004-04-27 | 2008-07-02 | 株式会社理光 | Switching regulator and method for changing output voltages thereof |
| JP5810305B2 (en) * | 2011-04-21 | 2015-11-11 | パナソニックＩｐマネジメント株式会社 | Lighting device and lighting apparatus |
| CN103947092B (en) * | 2011-10-26 | 2017-02-08 | 美高森美公司 | Converter with hysteretic control |
| CN204291461U (en) * | 2014-11-25 | 2015-04-22 | 深圳市润杰明成照明科技有限公司 | A kind of drive circuit without stroboscopic LED lamp and drive unit |
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