CN113853042A - LED color temperature adjusting circuit capable of effectively preventing current overshoot - Google Patents
LED color temperature adjusting circuit capable of effectively preventing current overshoot Download PDFInfo
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- CN113853042A CN113853042A CN202010597396.8A CN202010597396A CN113853042A CN 113853042 A CN113853042 A CN 113853042A CN 202010597396 A CN202010597396 A CN 202010597396A CN 113853042 A CN113853042 A CN 113853042A
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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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- 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]
- H05B45/20—Controlling the colour of the light
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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]
- H05B45/30—Driver circuits
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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]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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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]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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- Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract
The invention relates to an LED color temperature adjusting circuit for effectively preventing current overshoot, which is respectively connected with a cold color temperature LED and a warm color temperature LED, and comprises an LED constant current driving circuit, a dimming control singlechip, a cold color temperature driving MOSFET and a warm color temperature driving MOSFET, wherein the LED constant current driving circuit is respectively connected with the dimming control singlechip, the cold color temperature driving MOSFET and the warm color temperature driving MOSFET, the cold color temperature driving MOSFET is connected with the cold color temperature LED, the warm color temperature driving MOSFET is connected with the warm color temperature LED, the adjusting circuit also comprises a color temperature adjusting driving circuit, and the color temperature adjusting driving circuit is respectively connected with the dimming control singlechip, the cold color temperature driving MOSFET and the warm color temperature driving MOSFET. Compared with the prior art, the invention has the advantages of reducing cost, ensuring reliability and the like.
Description
Technical Field
The invention relates to an LED color temperature adjusting circuit, in particular to an LED color temperature adjusting circuit capable of effectively preventing current overshoot.
Background
The existing mainstream mature color temperature adjusting LED driver product has the circuit shown in a block diagram 1, and a group of DC/DC is respectively used for driving a cold color temperature LED and a warm color temperature LED, so that the color temperature adjusting circuit has good effect and is also reliable, but the DCDC driving circuit has high cost.
In addition, as shown in a block diagram 2, the circuit of the low-cost color temperature adjusting LED driver is that the existing cold color temperature driving MOSFET202 and the existing warm color temperature driving MOSFET203 are respectively and simply driven by the PWM signal of the existing dimming control single chip microcomputer two 201 to switch the LED constant current driving circuit 200 to flow to the existing cold color temperature LED two 204 or the existing warm color temperature LED two 205.
When the product shown in the block diagram 2 is used, when the existing cold color temperature driving MOSFET202 driven by the single-chip machine PWM2 and the existing warm color temperature driving MOSFET203 is turned on, because the PWM3 passes through the signal inverter 206, the inverted PWM3 signal will have a time delay, and finally, the turn-on timing of the two MOSFETs shown in fig. 3 will be caused, so that the LED constant current driving circuit will be unloaded when the two MOSFETs are switched.
The two PWM signals of the single chip microcomputer are used for respectively controlling the two MOSFETs to switch, and the LED constant-current driving circuit can be in no-load when the two MOSFETs are switched because the two PWM signals are not synchronous.
Since LED drivers are typically current sources, the current sources are not open-circuited in nature. Therefore, if the two color temperature adjusting MOSFETs do not overlap the conduction time, the LED constant current driving circuit is opened when the two MOSFETs are switched, which results in an increase in output voltage, and when the other MOSFET is turned on at the end of switching, the instantaneous current is too large, which may damage the LED and the MOSFET. Just as with the MOSFET switching sequence of fig. 3, LED and MOSFET damage can result. And both MOSFETs are turned on simultaneously during switching, which avoids this problem.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and to provide a color temperature adjusting circuit for an LED, which effectively prevents current overshoot.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides an effectively prevent LED colour temperature regulating circuit that electric current overshot, this circuit is connected with cold colour temperature LED and warm colour temperature LED respectively, regulating circuit include LED constant current drive circuit, dimming control singlechip, cold colour temperature drive MOSFET and warm colour temperature drive MOSFET, LED constant current drive circuit be connected with dimming control singlechip, cold colour temperature drive MOSFET and warm colour temperature drive MOSFET respectively, cold colour temperature drive MOSFET be connected with cold colour temperature LED, warm colour temperature drive MOSFET be connected with warm colour temperature LED, regulating circuit still include colour temperature regulation drive circuit, this colour temperature regulation drive circuit is connected with dimming control singlechip, cold colour temperature drive MOSFET and warm colour temperature drive MOSFET respectively.
Preferably, the color temperature adjusting drive circuit comprises a signal inverter U2, an R/S trigger U1, a booster circuit, a boosting delay circuit, a first totem-pole circuit and a second totem-pole circuit, the signal inverter U2 is connected with the R/S trigger U1 through the booster circuit and the boosting delay circuit respectively, the R/S trigger U1 is connected with the cold color temperature LED through the first totem-pole circuit, the R/S trigger U1 is connected with the warm color temperature LED through the second totem-pole circuit, and the signal inverter U2 is connected with the dimming control single chip microcomputer.
Preferably, the boosting circuit comprises a transistor Q9 and a transistor Q10, and is used for boosting the 3.3V signal to 15V and outputting the signal to the R/S trigger U1.
Preferably, the base of the transistor Q9 is connected to the signal inverter U2 through a resistor R16, the emitter is connected to the R1 pin of the R/S flip-flop U1, and the collector is grounded.
Preferably, the transistor Q10 is connected to the signal inverter U2 through a resistor R17, the emitter is connected to the R2 pin of the R/S flip-flop U1, and the collector is grounded.
Preferably, the boost delay circuit comprises a transistor Q11 and a transistor Q12, and is used for boosting the 3.3V signal to 15V and delaying the output signal to output to the R/S flip-flop U1.
Preferably, the base of the transistor Q11 is connected to the signal inverter U2 through a resistor R18, while the base is grounded through a capacitor C3, the emitter is connected to the S1 pin of the R/S flip-flop U1, and the collector is grounded.
Preferably, the base of the transistor Q12 is connected to the signal inverter U2 through a resistor R19, while the base is grounded through a capacitor C4, the emitter is connected to the S2 pin of the R/S flip-flop U1, and the collector is grounded.
Preferably, the first totem pole circuit comprises a transistor Q1 and a transistor Q3, wherein the base of the transistor Q1 is connected with the base of the transistor Q3, and the emitter of the transistor Q1 is connected with the emitter of the transistor Q3 and then connected with the cold color temperature driving MOSFET Q4;
the second totem pole circuit comprises a triode Q5 and a triode Q7, the base of the triode Q5 is connected with the base of the triode Q7, and the emitter of the triode Q5 is connected with the emitter of the triode Q7 and then connected with a warm color temperature driving MOSFET Q8.
Preferably, the cold color temperature driving MOSFET Q4 outputs through an inductor L1 and a diode D1;
the warm color temperature driving MOSFET Q8 outputs through an inductor L2 and a diode D2.
Compared with the prior art, the invention has the following advantages:
1) compared with a product which drives an LED by using a two-channel DCDC, the technical scheme of the invention has lower cost, but has equivalent effect and ensured reliable performance;
2) compared with a simple product which uses two MOSFETs to drive the LEDs, the technical scheme of the invention has little cost increase but can not cause LED damage;
3) the technical scheme of the invention can reduce cost, ensure reliability, achieve higher light modulation and color temperature modulation precision, and has competitive power compared with similar products in the market.
Drawings
FIG. 1 is a diagram illustrating a conventional two-channel DCDC driving LED;
FIG. 2 is a schematic diagram of a prior art LED driven by two MOSFETs;
FIG. 3 is a timing diagram of the switching of a conventional MOSFET;
FIG. 4 is a schematic structural view of the present invention;
FIG. 5 is a specific circuit diagram of the present invention;
FIG. 6 is a timing diagram illustrating a switching process according to the present invention.
Wherein 100 is AC/DC, 101 is the existing dimming control singlechip I, 102 is the cold color temperature driving DCDC, 103 is the warm color temperature driving DCDC, 104 is the existing cold color temperature LED I, and 105 is the existing warm color temperature LED I;
200 is an existing LED constant current driving circuit, 201 is an existing dimming control singlechip II, 202 is an existing cold color temperature driving MOSFET, 203 is an existing warm color temperature driving MOSFET, 204 is an existing cold color temperature LED II, 205 is an existing warm color temperature LED II, and 206 is a signal inverter;
300 is an LED constant current drive circuit, 301 is a dimming control singlechip, 302 is a color temperature adjustment drive circuit, 303 is a cold color temperature drive MOSFET, 304 is a warm color temperature drive MOSFET, 305 is a cold color temperature LED, and 306 is a warm color temperature LED.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
As shown in fig. 4, an LED color temperature adjusting circuit for effectively preventing current overshoot is connected to a cold color temperature LED305 and a warm color temperature LED306, the adjusting circuit includes an LED constant current driving circuit 300, a dimming control single chip microcomputer 301, a cold color temperature driving MOSFET303 and a warm color temperature driving MOSFET304, the LED constant current driving circuit 300 is connected to the dimming control single chip microcomputer 301, the cold color temperature driving MOSFET303 and the warm color temperature driving MOSFET304, the cold color temperature driving MOSFET303 is connected to the cold color temperature LED305, the warm color temperature driving MOSFET304 is connected to the warm color temperature LED306, the adjusting circuit further includes a color temperature adjusting driving circuit 302, and the color temperature adjusting driving circuit 302 is connected to the dimming control single chip microcomputer 301, the cold color temperature driving MOSFET303 and the warm color temperature driving MOSFET 304.
The color temperature adjusting drive circuit 302 comprises a signal phase inverter U2, an R/S trigger U1, a booster circuit, a boosting delay circuit, a first totem-pole circuit and a second totem-pole circuit, the signal phase inverter U2 is respectively connected with the R/S trigger U1 through the booster circuit and the boosting delay circuit, the R/S trigger U1 is connected with the cold color temperature LED305 through the first totem-pole circuit, the R/S trigger U1 is connected with the warm color temperature LED306 through the second totem-pole circuit, and the signal phase inverter U2 is connected with the dimming control single chip microcomputer 301.
The boosting circuit comprises a triode Q9 and a triode Q10, and is used for boosting a 3.3V signal to 15V and outputting the signal to an R/S trigger U1. The base electrode of the triode Q9 is connected with the signal inverter U2 through a resistor R16, the emitter electrode is connected with the R1 pin of the R/S trigger U1, and the collector electrode is grounded. The triode Q10 is connected with the signal inverter U2 through a resistor R17, an emitter is connected with the R2 pin of the R/S trigger U1, and a collector is grounded.
The boosting delay circuit comprises a triode Q11 and a triode Q12, and is used for boosting a 3.3V signal to 15V, delaying an output signal and outputting the output signal to an R/S trigger U1. The base of the triode Q11 is connected with the signal inverter U2 through a resistor R18, the base is grounded through a capacitor C3, the emitter is connected with the S1 pin of the R/S trigger U1, and the collector is grounded. The base of the triode Q12 is connected with the signal inverter U2 through a resistor R19, the base is grounded through a capacitor C4, the emitter is connected with the S2 pin of the R/S trigger U1, and the collector is grounded.
The first totem pole circuit comprises a triode Q1 and a triode Q3, the base electrode of the triode Q1 is connected with the base electrode of the triode Q3, and the emitting electrode of the triode Q1 is connected with the emitting electrode of the triode Q3 and then connected with a cold color temperature driving MOSFET Q4; the second totem pole circuit comprises a triode Q5 and a triode Q7, the base of the triode Q5 is connected with the base of the triode Q7, and the emitter of the triode Q5 is connected with the emitter of the triode Q7 and then connected with a warm color temperature driving MOSFET Q8.
The cold color temperature driving MOSFET Q4 outputs through an inductor L1 and a diode D1; the warm color temperature driving MOSFET Q8 outputs through an inductor L2 and a diode D2.
The specific principle is as follows:
in the invention, a single PWM signal and a logic circuit are used for controlling the switching of the two MOSFETs, so that the switching of the MOSFETs cannot be affected by the problem of asynchronous PWM signals caused by two different PWM outputs of the singlechip.
The dimming control single chip microcomputer 301 sends a PWM1 signal to adjust the output current of the LED constant current driving circuit 300 after receiving the digital instruction; the PWM2 signal is sent to adjust the proportion of the output current of the LED constant current drive circuit 300 that is distributed to the cold color temperature LED305 and the warm color temperature LED306 to adjust the color temperature.
The color temperature adjusting driving circuit in the invention is controlled by only one PWM2 signal and then passes through the reverse signal of the signal inverter U2. The 3.3V signal is boosted to 15V through Q9 and Q10 and output to R1 and R2 pins of an R/S trigger U1; the Q11 and Q12 can boost the 3.3V signal to 15V and also delay the output signal to the S1 and S2 pins of the R/S flip-flop U1. The design can delay the falling edges of two output signals of the Q1 and Q2 pins of the R/S trigger U1. Signals output by the pins Q1 and Q2 drive a cold color temperature driving MOSFET Q4 and a warm color temperature driving MOSFET Q8 through the current gains of two groups of totem pole circuits Q1, Q3, Q5 and Q7. The turn-on switching sequences of the final cold color temperature driving MOSFET Q4 and the warm color temperature driving MOSFET Q8 are shown in fig. 6. The two MOSFETs will overlap when switched, and the overlapping conduction may bring about a slight deviation of the color temperature adjustment, which can be corrected. The overlap time Δ t when the two MOSFETs are switched can be adjusted by adjusting the parameters R18, C3, R19 and C4.
The L1, the D1, the L2 and the D2 can eliminate current spikes when the Q4 and the Q8 are switched, and protect the LED.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An LED color temperature adjusting circuit effectively preventing current overshoot, the circuit being connected with a cold color temperature LED (305) and a warm color temperature LED (306), respectively, the adjusting circuit comprises an LED constant current driving circuit (300), a dimming control singlechip (301), a cold color temperature driving MOSFET (303) and a warm color temperature driving MOSFET (304), the LED constant current drive circuit (300) is respectively connected with the dimming control singlechip (301), the cold color temperature drive MOSFET (303) and the warm color temperature drive MOSFET (304), the cold color temperature driving MOSFET (303) is connected with the cold color temperature LED (305), the warm color temperature driving MOSFET (304) is connected with the warm color temperature LED (306), characterized in that the adjusting circuit also comprises a color temperature adjusting drive circuit (302), the color temperature adjusting drive circuit (302) is respectively connected with the dimming control single chip microcomputer (301), the cold color temperature drive MOSFET (303) and the warm color temperature drive MOSFET (304).
2. The LED color temperature adjusting circuit capable of effectively preventing current overshoot as claimed in claim 1, wherein the color temperature adjusting driving circuit (302) comprises a signal inverter U2, an R/S flip-flop U1, a voltage boosting circuit, a voltage boosting delay circuit, a first totem-pole circuit and a second totem-pole circuit, the signal inverter U2 is connected to the R/S flip-flop U1 through the voltage boosting circuit and the voltage boosting delay circuit, the R/S flip-flop U1 is connected to the cold color temperature LED (305) through the first totem-pole circuit, the R/S flip-flop U1 is connected to the warm color temperature LED (306) through the second totem-pole circuit, and the signal inverter U2 is connected to the dimming control single chip (301).
3. The LED color temperature adjusting circuit for effectively preventing current overshoot as claimed in claim 2, wherein the boost circuit comprises a transistor Q9 and a transistor Q10 for boosting the 3.3V signal to 15V and outputting to the R/S flip-flop U1.
4. The LED color temperature adjusting circuit for effectively preventing current overshoot as claimed in claim 3, wherein the transistor Q9 has a base connected to the signal inverter U2 through a resistor R16, an emitter connected to the R1 pin of the R/S flip-flop U1, and a collector connected to ground.
5. The LED color temperature adjusting circuit for effectively preventing current overshoot as claimed in claim 3, wherein the transistor Q10 is connected to the signal inverter U2 through a resistor R17, the emitter is connected to the R2 pin of the R/S flip-flop U1, and the collector is grounded.
6. The LED color temperature adjusting circuit of claim 2, wherein the step-up delay circuit comprises a transistor Q11 and a transistor Q12 for stepping up the 3.3V signal to 15V and delaying the output signal to the R/S flip-flop U1.
7. The LED color temperature adjusting circuit for effectively preventing current overshoot as claimed in claim 6, wherein the transistor Q11 has a base connected to the signal inverter U2 through a resistor R18, a base connected to ground through a capacitor C3, an emitter connected to the S1 pin of the R/S flip-flop U1, and a collector connected to ground.
8. The LED color temperature adjusting circuit for effectively preventing current overshoot as claimed in claim 6, wherein the transistor Q12 has a base connected to the signal inverter U2 through a resistor R19, a base connected to ground through a capacitor C4, an emitter connected to the S2 pin of the R/S flip-flop U1, and a collector connected to ground.
9. The LED color temperature adjusting circuit according to claim 2, wherein the first totem pole circuit comprises a transistor Q1 and a transistor Q3, a base of the transistor Q1 is connected to a base of the transistor Q3, an emitter of the transistor Q1 is connected to an emitter of the transistor Q3 and then connected to the cold color temperature driving MOSFET Q4;
the second totem pole circuit comprises a triode Q5 and a triode Q7, the base of the triode Q5 is connected with the base of the triode Q7, and the emitter of the triode Q5 is connected with the emitter of the triode Q7 and then connected with a warm color temperature driving MOSFET Q8.
10. The LED color temperature adjusting circuit of claim 9, wherein the cold color temperature driving MOSFET Q4 outputs through an inductor L1 and a diode D1;
the warm color temperature driving MOSFET Q8 outputs through an inductor L2 and a diode D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010597396.8A CN113853042A (en) | 2020-06-28 | 2020-06-28 | LED color temperature adjusting circuit capable of effectively preventing current overshoot |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010597396.8A CN113853042A (en) | 2020-06-28 | 2020-06-28 | LED color temperature adjusting circuit capable of effectively preventing current overshoot |
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