CN108934110B - Dimming control circuit and method for LED lamp at low brightness - Google Patents
Dimming control circuit and method for LED lamp at low brightness Download PDFInfo
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- CN108934110B CN108934110B CN201810951151.3A CN201810951151A CN108934110B CN 108934110 B CN108934110 B CN 108934110B CN 201810951151 A CN201810951151 A CN 201810951151A CN 108934110 B CN108934110 B CN 108934110B
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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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Abstract
The invention relates to a dimming control circuit of LED lamps under low brightness and a control method thereof, wherein the dimming control circuit comprises a triode Q1, a triode Q2 and a dimming driver, the base electrode of a triode Q1 is connected with the positive electrode of the dimming driver through a resistor R1 and the negative electrode of the dimming driver through a resistor R2, the collector electrode and the emitter electrode of the triode Q1 are respectively connected with the positive electrode and the negative electrode of the dimming driver, the collector electrode of the triode Q1 is connected with the base electrode of a triode Q2, the collector electrode and the emitter electrode of a triode Q2 are respectively connected with the positive electrode and the negative electrode of the dimming driver, the collector electrode and the emitter electrode of a triode Q2 are also respectively connected with the positive electrode and the negative electrode of the LED lamps, when the output current I of the dimming driver is lower than a current limit value I1 and higher than a current limit value I2, the triode Q1 and the triode Q2 are in a semi-conducting state, and the current on the LED lamps is changed in a curve mode, and the dimming effect of the LED lamps.
Description
Technical Field
The invention relates to LED lamp driving circuits, in particular to a dimming control circuit and a dimming control method for LED lamps under low brightness.
Background
The operating principle of the dimming circuit is that the thyristor dimmer is used for adjusting the conduction angle of each half-wave of alternating current to change a sine wave shape, change the effective value of alternating current input current and simultaneously change the driving output current, thereby realizing the dimming effect of the LED lamp, however, the thyristor dimmers are various, when part of the thyristor dimmers adjust the output current to be less than about 3 percent, the dimming effect can be lost, namely, when the LED lamp is in low brightness, the current thyristor dimmers can not realize the control of the output current, namely, the dimming effect can not be realized.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides kinds of dimming control circuits and control methods for LED lamps at low brightness, which can achieve dimming effect for LED lamps at low current output of the dimmer, i.e. can achieve dimming effect even at low brightness of LED lamps.
The technical problem is solved by the technical scheme that the dimming control circuit of the LED lamp under low brightness comprises a triode Q1, a triode Q2 and a dimming driver, wherein the base of the triode Q1 is connected with the positive pole of the dimming driver through a resistor R1 and is connected with the negative pole of the dimming driver through a resistor R2, the collector and the emitter of a triode Q1 are respectively connected with the positive pole and the negative pole of the dimming driver, the collector of a triode Q1 is connected with the base of the triode Q2, the collector and the emitter of a triode Q2 are respectively connected with the positive pole and the negative pole of the dimming driver, the collector and the emitter of a triode Q2 are also respectively connected with the positive pole and the negative pole of the LED lamp, the two triodes form a power circuit, when the output current I of the dimming driver is greater than or equal to a current limiting value I1, the triode Q1 is turned on, the Q2 is turned off, when the output current I of the dimming driver is less than or equal to a current limiting I , the output current I of the triode Q1 is cut off, when the output current of the dimming driver is lower than a dimming current limiting I, the output of the LED lamp, the dimming driver is equal to the output current I of the dimming driver, the dimming driver is equal to the dimming driver, the output of the dimming driver is equal to the output of the LED lamp under the dimming lamp under the low brightness of the LED lamp, the dimming lamp is equal to be.
Preferably, the collector of the transistor Q1 passes through the resistor R3 and the anode of the dimming driver.
Preferably, the emitter of the triode Q2 is connected to the cathode of the LED lamp via a resistor R4.
Preferably, the dimming control circuit of the LED lamp at low brightness comprises a resistor R5, wherein a terminal of the resistor R5 is connected to a negative electrode of the dimming driver, and another terminal of the resistor R5 is connected to a base of a transistor Q1 via a resistor R2.
Preferably, the resistor R1 and the resistor R2 are variable resistors, and the current value I1 limited by and the current value I2 limited by of the output current I of the dimming driver can be adjusted by changing the resistance values of the resistor R1 and the resistor R2 so as to match different dimming drivers.
Preferably, the transistor Q1 and the transistor Q2 are both NPN transistors.
Preferably, the dimming driver is a thyristor dimmer.
The control method of the dimming control circuit of the LED lamp under the low brightness comprises the steps that under the adjustment of the dimming driver, when the output current I of the dimming driver is larger than or equal to current limit value I1, a triode Q1 is conducted, a triode Q2 is cut off, the brightness of the LED lamp is not influenced by the dimming control circuit, under the adjustment of the dimming driver, when the output current I of the dimming driver is lower than current limit value I1 and higher than current limit value I2, the triode Q1 is in a semi-conducting state, works in an amplifying area, the triode Q2 starts to be conducted and also works in a semi-conducting state, at the moment, the current flowing through the LED lamp is changed in a curve along with the change of the output current I of the dimming driver, namely the brightness of the LED lamp is adjustable, and under the adjustment of the dimming driver, when the output current I of the dimming driver is smaller than or equal to current limit value I2, the triode Q1 is cut off, the triode Q2 is conducted, and the LED lamp is turned off.
Preferably, the -limited current value I1 and the -limited current value I2 of the output current I of the dimming driver can be adjusted to match different dimming drivers by changing the resistances of the resistor R1 and the resistor R2.
The invention has the beneficial effects that: through the power circuit that two triodes constitute, make it can realize the dimming effect to the LED lamp under the dimmer low current output condition, still can realize the dimming effect under the LED lamp low-luminance promptly, enlarge the dimming range of LED lamp, use more nimble and convenient.
Drawings
Fig. 1 is a schematic diagram of circuits of the present invention.
In the figure, 1 is a dimming driver, and 2 is an LED lamp.
Detailed Description
The technical solution of the present invention is further specifically described by way of example with reference to the accompanying drawings.
In an embodiment, as shown in fig. 1, the dimming control circuit for LED lamp at low brightness in this embodiment includes a transistor Q1, a transistor Q2, and a dimming driver 1, wherein a base of the transistor Q1, a path is connected to an anode of the dimming driver via a resistor R1, another path is connected to an end of a resistor R2, another end of the resistor R2 is connected to an emitter of the transistor Q1 via a resistor R5, an emitter of the transistor Q1 is connected to a cathode of the dimming driver, a collector of the transistor Q1 is connected to the anode of the dimming driver via a resistor R1, a collector of the transistor Q1 is connected to the base of the transistor Q1, a collector of the transistor Q1 is connected to both the anode of the dimming driver and the cathode of the LED lamp 2, an emitter of the transistor Q1 is connected to a 1 end of the resistor R1, another end of the resistor R1 is connected to a connection point of the resistor R1 and the cathode of the dimming driver, and the transistor R1 are both the triode Q1 and the dimming driver, and the triode Q1 are of the triode R1, and the dimmer.
The control method of the dimming control circuit of the LED lamp under the low brightness comprises the following steps:
under the adjustment of the dimming driver, when the output current I of the dimming driver is greater than or equal to current limit value I1, the base voltage of a triode Q1 reaches a switching-on condition, a triode Q1 is switched on, the voltage of the base of the triode Q2 is pulled down by the collector voltage of a triode Q1, a triode Q2 is cut off, only weak current flows through a resistor R3 and the triode Q1, and therefore the brightness of the LED lamp is not influenced by the dimming control circuit;
under the adjustment of the dimming driver, when the output current I of the dimming driver is lower than current limit value I1 and higher than current limit value I2, the base voltage of the transistor Q1 decreases with the decrease of the output current of the dimming driver, the transistor Q1 is in a semi-conducting state and works in an amplifying region, the base voltage of the transistor Q2 rises, the transistor Q2 starts to conduct and also works in a semi-conducting state, and works in the amplifying region, the output current of the dimming driver flows through a power loop formed by the transistor Q2 and a resistor R4, and when the output current of the dimming driver decreases, the brightness of the LED lamp decreases, namely, the current flowing through the LED lamp changes in a curve with the change of the output current I of the dimming driver, and the brightness of the LED lamp is adjustable;
under the adjustment of the dimming driver, when the output current I of the dimming driver is smaller than or equal to current limit value I2, the triode Q1 is completely cut off, the base voltage of the triode Q2 is raised, the triode Q2 is completely conducted, the current output by the dimming driver completely flows through a power loop formed by the triode Q2 and the resistor R4, at the moment, no current flows through the LED lamp, and the LED lamp is turned off.
By changing the resistance values of the resistor R1 and the resistor R2, the current limit value I1 and the current limit value I2 of the output current I of the dimming driver can be adjusted to match different dimming drivers.
The power circuit formed by the two triodes can realize the dimming effect of the LED lamp under the condition of low current output of the dimmer, namely the dimming effect can be realized under the condition of low brightness of the LED lamp, the dimming range of the LED lamp is expanded, and the LED lamp is more flexible and convenient to use.
Claims (2)
- A method for controlling a dimming control circuit of an LED lamp in low brightness is characterized in that the dimming control circuit of the LED lamp in low brightness comprises a triode Q1, a triode Q2 and a dimming driver, wherein a base of the triode Q1 is connected with an anode of the dimming driver through a resistor R1 and a cathode of the dimming driver through a resistor R2, a collector and an emitter of a triode Q1 are respectively connected with an anode and a cathode of the dimming driver, a collector of the triode Q1 is connected with a base of a triode Q2, a collector and an emitter of the triode Q2 are respectively connected with an anode and a cathode of the dimming driver, a collector and an emitter of a triode Q2 are respectively connected with an anode and a cathode of the LED lamp, the method is that under the adjustment of the dimming driver, when an output current I of the dimming driver is greater than or equal to a current limit I1, the triode Q1 is turned on, the triode Q2 is turned off, the brightness of the LED lamp is not affected by the dimming control circuit, when the output current I of the dimming driver is greater than or equal to an I limit I8624, the dimming driver is lower value, when the output current of the dimming driver is lower than an output current limit 3628, the output of the LED lamp, the LED lamp is equal to an amplified current limit value I , the LED lamp, the output of the LED lamp, the LED lamp is equal to an LED lamp in a high current limit value of the LED lamp, the LED lamp is equal to be equal to an LED lamp operating region, the LED lamp operating current limit lamp operating region of the LED lamp, the LED lamp is equal to be equal to an LED lamp operating current.
- 2. The method as claimed in claim 1, wherein the current-limiting value I1 and the current-limiting value I2 of the output current I of the dimming driver are adjusted to match different dimming drivers by changing the resistances of the resistor R1 and the resistor R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810951151.3A CN108934110B (en) | 2018-08-20 | 2018-08-20 | Dimming control circuit and method for LED lamp at low brightness |
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| CN201810951151.3A CN108934110B (en) | 2018-08-20 | 2018-08-20 | Dimming control circuit and method for LED lamp at low brightness |
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| CN108934110A CN108934110A (en) | 2018-12-04 |
| CN108934110B true CN108934110B (en) | 2020-01-31 |
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| CN117528858B (en) * | 2024-01-08 | 2024-04-09 | 杭州罗莱迪思科技股份有限公司 | Hidden-lighting controllable dimming lamp control method |
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| CN102014546A (en) * | 2009-09-04 | 2011-04-13 | 东芝照明技术株式会社 | Led lighting device and illumination apparatus |
| CN102355771A (en) * | 2011-08-16 | 2012-02-15 | 吴广毅 | LED (Light-emitting Diode) circuit capable of effectively controlling overcurrent value in circuit |
| CN204377181U (en) * | 2014-08-01 | 2015-06-03 | 田新汉 | Light-operated electricity-saving dimming LED |
| CN204598391U (en) * | 2015-04-22 | 2015-08-26 | 深圳市中科智联科技有限公司 | A kind of circuit simultaneously controlling LED brightness, colour temperature |
| CN104968080A (en) * | 2014-11-28 | 2015-10-07 | 成都雷克尔科技有限公司 | Dual-power amplification type filtering drain electrode drive system for blue-light LED lamp |
| CN205987455U (en) * | 2016-07-22 | 2017-02-22 | 飞利浦照明（中国）投资有限公司 | A interface device and lighting system for phase cut light modulator and electronic transformer |
| CN106879120A (en) * | 2017-03-30 | 2017-06-20 | 佛山市华永泰光电科技有限公司 | Can be while start anti-lightning road of the adjusting brightness of LED lamps with color and its method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9491820B2 (en) * | 2014-03-04 | 2016-11-08 | Osram Sylvania Inc. | Hybrid dimming control techniques for LED drivers |
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- 2018-08-20 CN CN201810951151.3A patent/CN108934110B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102014546A (en) * | 2009-09-04 | 2011-04-13 | 东芝照明技术株式会社 | Led lighting device and illumination apparatus |
| CN102355771A (en) * | 2011-08-16 | 2012-02-15 | 吴广毅 | LED (Light-emitting Diode) circuit capable of effectively controlling overcurrent value in circuit |
| CN204377181U (en) * | 2014-08-01 | 2015-06-03 | 田新汉 | Light-operated electricity-saving dimming LED |
| CN104968080A (en) * | 2014-11-28 | 2015-10-07 | 成都雷克尔科技有限公司 | Dual-power amplification type filtering drain electrode drive system for blue-light LED lamp |
| CN204598391U (en) * | 2015-04-22 | 2015-08-26 | 深圳市中科智联科技有限公司 | A kind of circuit simultaneously controlling LED brightness, colour temperature |
| CN205987455U (en) * | 2016-07-22 | 2017-02-22 | 飞利浦照明（中国）投资有限公司 | A interface device and lighting system for phase cut light modulator and electronic transformer |
| CN106879120A (en) * | 2017-03-30 | 2017-06-20 | 佛山市华永泰光电科技有限公司 | Can be while start anti-lightning road of the adjusting brightness of LED lamps with color and its method |
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| CN108934110A (en) | 2018-12-04 |
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Address after: No.12 tingchao Road, Jianshan New District, Haining City, Jiaxing City, Zhejiang Province Patentee after: Zhejiang kaiyao Lighting Co.,Ltd. Address before: No.12 tingchao Road, Jianshan New District, Haining City, Jiaxing City, Zhejiang Province Patentee before: ZHEJIANG KLITE LIGHTING HOLDINGS Co.,Ltd. |
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