CN109379806B - Dimming drive circuit, dimming controller and LED lamp - Google Patents
Dimming drive circuit, dimming controller and LED lamp Download PDFInfo
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- CN109379806B CN109379806B CN201811219243.9A CN201811219243A CN109379806B CN 109379806 B CN109379806 B CN 109379806B CN 201811219243 A CN201811219243 A CN 201811219243A CN 109379806 B CN109379806 B CN 109379806B
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- 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
- H05B45/37—Converter circuits
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Abstract
The invention discloses a dimming driving circuit which comprises an EMI (electro-magnetic interference) filter circuit, a rectifying circuit, a PFC (power factor correction) circuit and a constant current driving circuit which are sequentially connected, and further comprises a phase stabilizing and detecting circuit, an isolating circuit and an MCU (microprogrammed control unit) adjusting circuit which are sequentially connected, wherein the input end of the phase stabilizing and detecting circuit is connected with the rectifying circuit, and the output end of the MCU adjusting circuit is connected with the constant current driving circuit. According to the invention, the alternating current phase state of the phase signal is detected through the phase stabilization and detection circuit, and the deep dimming below 1% can be realized through the conversion of two dimming modes of the MCU regulation circuit, so that the problem of unstable dimming below 5% of the existing dimmer is solved.
Description
Technical Field
The invention relates to the technical field of LED dimming driving, in particular to a dimming driving circuit.
Background
Compared with the traditional light source, the LED lighting has the advantages of greenness, energy conservation, environmental protection and the like, and the dimmable light is also an important advantage. Common dimming approaches include analog dimming, PWM dimming, wall switch dimming, and ac phase dimming.
Ac phase dimming is a commonly used dimming method at present. Referring to fig. 1, fig. 1 shows a conventional phase dimming schematic block diagram, which includes an ac input power 101, a phase dimmer 102, a dimming driving circuit 103, and an LED lamp 104 connected in sequence, where the phase dimmer 102 controls a phase of each half cycle of an input ac power, and the dimming driving circuit 103 outputs a current corresponding to a phase angle of the ac power to the LED lamp 104 according to the phase angle of the ac power, so as to achieve a purpose of adjusting brightness of the lamp.
The phase dimmer 102 requires a minimum holding current to maintain the normal operation of the phase dimmer 102 when controlling the ac phase to be turned on and off, and the dimming driving circuit 103 performs power conversion operation normally when the phase angle is turned on, and consumes current to maintain the normal operation of the phase dimmer 102; however, when the phase angle is cut off, the power conversion of the dimming driving circuit 103 is changed to minimum operation or no power conversion, and the current consumed by the dimming driving circuit 103 is small, so that the minimum holding current requirement of the phase dimmer 102 cannot be met, and thus the brightness is unstable, and there is a difference between different phase dimmers.
The existing phase dimmer can only adjust the brightness to 10% -5%, and the unstable phenomenon occurs when the brightness is adjusted to below 5%.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a dimming driving circuit which is used for solving the problem that the brightness of the conventional phase dimmer is unstable when being adjusted to be below 5%.
The invention comprises the following contents:
a dimming drive circuit comprises an EMI filter circuit, a rectifying circuit, a PFC circuit and a constant current drive circuit which are sequentially connected, and further comprises a phase stabilization and detection circuit, an isolation circuit and an MCU (microprogrammed control unit) adjusting circuit which are sequentially connected, wherein the input end of the phase stabilization and detection circuit is connected with the rectifying circuit, and the output end of the MCU adjusting circuit is connected with the constant current drive circuit.
Preferably, the phase stabilization and detection circuit includes a first voltage dividing resistor, a second voltage dividing resistor, a pull-down resistor R7, a MOS transistor Q1, a zener diode Z1 and a transistor Q2, an input end of the first voltage dividing resistor is connected to the rectification circuit, a connection node is a node a, an output end of the first voltage dividing resistor is connected to a drain of the MOS transistor Q1, a source of the MOS transistor is grounded, a gate of the MOS transistor Q1 is connected to a first voltage terminal Vcc, an input end of the second voltage dividing resistor is connected to the node a, an output end of the second voltage dividing resistor is connected to one end of the pull-down resistor R7, a connection node B is a node B, the other end of the pull-down resistor R7 is grounded, a cathode of the zener diode Z1 is connected to the node B, an anode of the zener diode Z1 is connected to a base of the transistor Q2, an emitter of the transistor Q2 is grounded, a collector of the transistor Q2 is connected to the first voltage, the collector of the triode Q2 is the output end of the phase stabilization and detection circuit, and the anode and the cathode of the voltage-stabilizing diode Z1 are respectively grounded through the filter capacitors C2 and C1.
Preferably, the isolation circuit comprises a photocoupler U1 and a diode D1, a diode input end of the photocoupler U1 is connected with the first voltage end Vcc through a resistor R11, a diode output end of the photocoupler U1 is connected with an anode of a diode D1, a cathode of the diode D1 is connected with the phase stabilization and detection circuit, a triode collector of the photocoupler U1 is connected with the second voltage end Vdd, a triode emitter of the photocoupler U1 is grounded through a pull-down resistor R51, and a triode emitter of the photocoupler U1 is an output end of the isolation circuit.
Preferably, the MCU regulating circuit includes an MCU processor U51, a power supply pin of the MCU processor U51 is connected to the second voltage terminal Vdd and is grounded through a filter capacitor C51, a fifth general pin GP4 of the MCU processor U51 is an input terminal, a fifth general pin GP4 of the MCU processor U51 is connected to the isolation circuit through a pi-type RC filter network, a third general pin GP2 of the MCU processor U51 is a first output terminal, the third general pin GP2 is connected to the constant current driving circuit through an RC parallel filter circuit, a sixth general pin GP5 of the MCU processor U51 is a second output terminal, and the sixth general pin GP5 is connected to the constant current driving circuit through a resistor R55.
Preferably, the EMI filter circuit includes a first inductor LF1 and a second inductor LF2, an input end of the first inductor LF1 is connected to the ac input end, an input end of the first inductor LF1 is further connected to a voltage dependent resistor VDR1 and a fuse element F1, an output end of the first inductor LF1 is connected to an input end of the second inductor LF2, an output end of the first inductor LF1 is further connected to an RC series filter circuit, an output end of the second inductor LF2 is connected to the rectifier circuit, an output end of the second inductor LF2 is further connected to a voltage dependent resistor VDR2, and resistors R2 and R3 are connected in parallel between the input end and the output end of the second inductor LF 2.
The invention also discloses a dimming controller which comprises a shell and a dimming switch arranged on the shell, wherein the dimming driving circuit is arranged in the shell.
The invention also discloses an LED lamp which comprises the dimming driving circuit and an LED lamp connected with the dimming driving circuit.
The invention has the beneficial effects that: according to the invention, the alternating current phase state of the phase signal is detected through the phase stabilization and detection circuit, and the deep dimming below 1% can be realized through the conversion of two dimming modes of the MCU regulation circuit, so that the problem of unstable dimming below 5% of the existing dimmer is solved.
Drawings
Fig. 1 is a schematic block diagram of a conventional phase dimming scheme;
FIG. 2 is a schematic block diagram of a preferred embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a preferred embodiment of the present invention;
FIG. 4 is a waveform diagram of each node during phase detection according to the preferred embodiment of the invention.
Detailed Description
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Referring to fig. 2, the dimming driving circuit disclosed in this embodiment includes an EMI filter circuit 202, a rectifier circuit 203, a PFC circuit 204, and a constant current driving circuit 205, which are sequentially connected, and further includes a phase stabilization and detection circuit 206, an isolation circuit 207, and an MCU adjustment circuit 208, which are sequentially connected, an input end of the phase stabilization and detection circuit 206 is connected to the rectifier circuit 203, and an output end of the MCU adjustment circuit 208 is connected to the constant current driving circuit 205. The alternating current input 201 is provided to the rectifying circuit 203 for rectification after the interference signal is filtered by the EMI filtering circuit 202, the PFC circuit 204 performs power conversion on the rectified alternating current, a constant direct current voltage is output to the constant current driving circuit 205, and the constant current driving circuit 205 directly drives the LED lamp through the power output 209. The phase stabilization and detection circuit 206 performs phase detection on the ac power output from the rectification circuit 204. The detected on-phase angle signal and off-phase angle signal are transmitted to the MCU regulating circuit 208 through the isolating circuit 207 for adjustment, and the MCU regulating circuit 208 outputs a control signal to the constant current driving circuit 205 to achieve the purpose of dimming.
Referring to fig. 3, the EMI filter circuit 202 includes a first inductor LF1 and a second inductor LF2, the first inductor LF1 and the second inductor LF2 both employ common mode inductors, an input end of the first inductor LF1 is connected to an ac input end, a voltage-sensitive resistor VDR1 is connected in parallel between input ends of the first inductor LF1, an input end of the first inductor LF1 is further connected to a fuse element F1, the fuse element F1 may employ a fuse tube or a fuse, an output end of the first inductor LF1 is connected to an input end of the second inductor LF2, an output end of the first inductor LF1 is further connected to an RC series filter circuit, the RC series filter circuit includes a resistor R1 and a capacitor CX1 connected in series, an output end of the second inductor LF2 is connected to the rectifier circuit, an output end of the second inductor LF2 is further connected to a voltage-sensitive vdresistor R2, a resistor R2 and a R3 are connected in parallel between the input end and the output end of the second inductor LF2, and the resistor LF2 and the output end are used for discharging after power is cut-off and.
The rectifying circuit 203 comprises a rectifying bridge BD1, an input end of the rectifying bridge BD1 is connected with the second inductor LF2, and an output end of the rectifying bridge BD1 is connected with the phase stabilization and detection circuit 206. The PFC circuit 204 adopts a single-stage PFC flyback constant voltage isolation circuit, and the constant current driving circuit 205 adopts a DC/DC buck LED constant current driving circuit.
The phase stabilizing and detecting circuit 206 comprises a first voltage-dividing resistor 21, a second voltage-dividing resistor 22, a pull-down resistor R7, a MOS transistor Q1, a zener diode Z1 and a triode Q2, wherein the first voltage-dividing resistor 21 comprises resistors R8 and R9 connected in series, the second voltage-dividing resistor 22 comprises resistors R4, R5 and R6 connected in series, an input end of the first voltage-dividing resistor 21 is connected with the rectifying circuit 203, the connection node is a node a, an output end of the first voltage-dividing resistor 21 is connected with a drain of the MOS transistor Q1, a source of the MOS transistor Q1 is grounded, a gate of the MOS transistor Q1 is connected with a first voltage terminal Vcc through a resistor R10, an input end of the second voltage-dividing resistor 22 is connected with a node a, an output end of the second voltage-dividing resistor 22 is connected with one end of the pull-down resistor R7, the connection node B is a node B, the other end of the pull-down resistor R7 is grounded, and a cathode of the zener diode Z1 is connected with a, the positive electrode of the voltage-stabilizing diode Z1 is connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with the first voltage end Vcc through a resistor R10, the collector electrode of the triode Q2 is the output end of the phase stabilization and detection circuit, and the positive electrode and the negative electrode of the voltage-stabilizing diode Z1 are grounded through a filter capacitor C2 and a filter capacitor C1 respectively.
The isolation circuit 207 comprises a photoelectric coupler U1 and a diode D1, the diode input end of the photoelectric coupler U1 is connected with a first voltage end Vcc through a resistor R11, the diode output end of the photoelectric coupler U1 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with the collector of a triode Q2, the collector of the triode of the photoelectric coupler U1 is connected with a second voltage end Vdd, the emitter of the triode of the photoelectric coupler U1 is grounded through a pull-down resistor R51, and the emitter of the triode of the photoelectric coupler U1 is the output end of the isolation circuit 207.
The MCU regulating circuit 208 includes an MCU processor U51, a power supply pin of the MCU processor U51 is connected to a second voltage terminal Vdd and is grounded through a filter capacitor C51, a fifth general pin GP4 of the MCU processor U51 is an input terminal, a fifth general pin GP4 of the MCU processor U51 is connected to a triode emitter of the photocoupler U1 through a pi-type RC filter network 23, a third general pin GP2 of the MCU processor U51 is a first output terminal, the third general pin GP2 is connected to the constant current driving circuit through an RC parallel filter circuit, the RC parallel filter circuit includes a resistor R56 and a capacitor C54, the resistor R56 is connected to one end of the capacitor C54, the other end of the capacitor C54 is grounded, a sixth general pin GP5 of the MCU processor U51 is a second output terminal, and the sixth general pin GP5 is connected to the constant current driving circuit 205 through a resistor R55.
The working principle of the embodiment is as follows:
referring to fig. 1, 3 and 4, assuming that the voltage value of the node a is Vhv, the regulated voltage value of the zener diode Z1 is Vth, and the output current of the source of the MOS transistor Q1 is Ihd, the voltage value of the node B is equal to the voltage divided by the voltage Vhv through the resistors R4, R5, R6 and R7, if the voltage value of the node B is lower than the voltage Vth, the resistors R8, R9 and the MOS transistor Q1 are turned on to maintain the holding current of the phase dimming, so as to stabilize the operating state of the phase dimmer, and the state at this time is a phase angle off state, and the phase stabilizing and detecting circuit transmits the state signal Vdet to the MCU adjusting circuit through the isolating circuit; if the voltage value of the node B is higher than the voltage Vth, the resistors R8 and R9 and the MOS transistor Q1 are turned off, no current is consumed, power loss can be reduced, the state at this time is a phase angle conducting state, and the phase stabilizing and detecting circuit transmits a state signal Vdet to the MCU regulating circuit through the isolation circuit.
After the interference signals of the state signals Vdet are filtered by the pi-type RC filter network, the MCU processor U51 performs ADC conversion and outputs two paths of PWM dimming signals through the first output terminal and the second output terminal, respectively, the PWM dimming signal output by the first output terminal of the MCU processor U51 is filtered by the resistor R56 and the capacitor C54 to generate an analog dimming signal, and the analog dimming signal is output to the constant current driving circuit 205 to realize linear dimming between 100% and 10%, and the PWM dimming signal output by the second output terminal of the MCU processor U51 is directly output to the constant current driving circuit 205 to realize linear dimming between 10% and 1%.
The embodiment also provides a dimming controller, which comprises a shell and a dimming switch arranged on the shell, wherein the dimming driving circuit is arranged in the shell.
The embodiment also provides an LED lamp, which includes the dimming driving circuit and an LED lamp connected to the dimming driving circuit.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.
Claims (5)
1. A dimming drive circuit comprises an EMI filter circuit (202), a rectifying circuit (203), a PFC circuit (204) and a constant current drive circuit (205) which are connected in sequence, and is characterized in that: the LED dimming circuit is characterized by further comprising a phase stabilization and detection circuit (206), an isolation circuit (207) and an MCU (microprogrammed control unit) regulation circuit (208) which are sequentially connected, wherein the input end of the phase stabilization and detection circuit (206) is connected with the rectifying circuit (203), the output end of the MCU regulation circuit (208) is connected with the constant current driving circuit (205), the MCU regulation circuit (208) is used for outputting dimming signals according to detection signals of the phase stabilization and detection circuit (206) in a split mode, the phase stabilization and detection circuit (206) comprises a first voltage-dividing resistor (21), a second voltage-dividing resistor (22), a pull-down resistor R7, an MOS tube Q1, a voltage-stabilizing diode Z1 and a triode Q2, the input end of the first voltage-dividing resistor (21) is connected with the rectifying circuit (203), a connection node A is adopted, and the output end of the first voltage-dividing resistor (21) is connected with the drain electrode of the MOS tube Q1, the source of the MOS tube is grounded, the grid of the MOS tube Q1 is connected with a first voltage end Vcc, the input end of the second divider resistor (22) is connected with a node A, the output end of the second divider resistor (22) is connected with one end of a pull-down resistor R7, the connection node is a node B, the other end of the pull-down resistor R7 is grounded, the negative electrode of a zener diode Z1 is connected with the node B, the positive electrode of a zener diode Z1 is connected with the base electrode of a triode Q2, the emitter electrode of a triode Q2 is grounded, the collector electrode of a triode Q2 is connected with the first voltage end Vcc, the collector electrode of a triode Q2 is the output end of a phase stabilization and detection circuit (206), the positive electrode and the negative electrode of the zener diode Z1 are grounded through a filter capacitor C2 and a filter C1 respectively, the MCU adjusting circuit (208) comprises an MCU processor U51, the power supply pin of the MCU processor U51 is connected with a second voltage end Vdd, a fifth general pin GP4 of the MCU processor U51 is an input terminal, a fifth general pin GP4 of the MCU processor U51 is connected to the isolation circuit (207) through a pi-type RC filter network (23), a third general pin GP2 of the MCU processor U51 is a first output terminal, the third general pin GP2 is connected to the constant current driving circuit (205) through an RC parallel filter circuit, a sixth general pin GP5 of the MCU processor U51 is a second output terminal, and the sixth general pin GP5 is connected to the constant current driving circuit (205) through a resistor R55.
2. The dimming driver circuit of claim 1, wherein: the isolation circuit (207) comprises a photoelectric coupler U1 and a diode D1, the diode input end of the photoelectric coupler U1 is connected with a first voltage end Vcc through a resistor R11, the diode output end of the photoelectric coupler U1 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with the phase stabilization and detection circuit (206), the triode collector of the photoelectric coupler U1 is connected with a second voltage end Vdd, the triode emitter of the photoelectric coupler U1 is grounded through a pull-down resistor R51, and the triode emitter of the photoelectric coupler U1 is the output end of the isolation circuit (207).
3. The dimming driver circuit of claim 1, wherein: EMI filter circuit (202) includes first inductance LF1 and second inductance LF2, first inductance LF 1's input is connected with alternating current input end, first inductance LF 1's input still is connected with piezo-resistor VDR1 and insurance component F1, first inductance LF 1's output is connected with second inductance LF 2's input, first inductance LF 1's output still is connected with RC series filter circuit, second inductance LF 2's output with rectifier circuit (203) are connected, second inductance LF 2's output still is connected with piezo-resistor VDR2, parallelly connected resistance R2 and R3 between second inductance LF 2's input and the output.
4. A dimmer control, comprising: the dimming switch comprises a shell and a dimming switch arranged on the shell, wherein the dimming driving circuit as claimed in any one of claims 1 to 3 is arranged in the shell.
5. An LED lamp, characterized in that: comprising a dimming driving circuit as claimed in any one of claims 1-3 and an LED lamp connected to the dimming driving circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811219243.9A CN109379806B (en) | 2018-10-19 | 2018-10-19 | Dimming drive circuit, dimming controller and LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811219243.9A CN109379806B (en) | 2018-10-19 | 2018-10-19 | Dimming drive circuit, dimming controller and LED lamp |
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| CN109379806A CN109379806A (en) | 2019-02-22 |
| CN109379806B true CN109379806B (en) | 2021-01-05 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109922566B (en) * | 2019-03-04 | 2024-01-12 | 深圳民爆光电股份有限公司 | Intelligent dimming LED driving device and LED lamp control system |
| CN111182672B (en) * | 2020-01-16 | 2021-06-29 | 深圳市英可瑞直流技术有限公司 | Illumination control method |
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| CN101835317A (en) * | 2010-05-28 | 2010-09-15 | 电子科技大学 | Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function |
| CN103369802A (en) * | 2013-08-02 | 2013-10-23 | 叶鸣 | Design method of LED (light-emitting diode) dimming driving switching power supply applied to various traditional dimmers |
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| CN205092997U (en) * | 2015-09-01 | 2016-03-16 | 惠州市欢腾智能科技有限公司 | High -power dimming controller |
| CN105682309A (en) * | 2014-11-18 | 2016-06-15 | 台达电子工业股份有限公司 | Led drive circuit and driving method thereof |
| CN108650748A (en) * | 2018-07-10 | 2018-10-12 | 无锡安特源科技股份有限公司 | A kind of constant pressure dimming power source device being compatible with a variety of dimming modes |
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2018
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|---|---|---|---|---|
| CN101835317A (en) * | 2010-05-28 | 2010-09-15 | 电子科技大学 | Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function |
| CN103369802A (en) * | 2013-08-02 | 2013-10-23 | 叶鸣 | Design method of LED (light-emitting diode) dimming driving switching power supply applied to various traditional dimmers |
| CN203661349U (en) * | 2013-11-19 | 2014-06-18 | 无锡安特源科技有限公司 | LED power source platform capable of realizing fusion of various light modulation modes |
| CN105682309A (en) * | 2014-11-18 | 2016-06-15 | 台达电子工业股份有限公司 | Led drive circuit and driving method thereof |
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