CN113423156A - Low-dimming-rate quick start circuit of LED dimming power supply and start method thereof - Google Patents
Low-dimming-rate quick start circuit of LED dimming power supply and start method thereof Download PDFInfo
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- CN113423156A CN113423156A CN202110681190.8A CN202110681190A CN113423156A CN 113423156 A CN113423156 A CN 113423156A CN 202110681190 A CN202110681190 A CN 202110681190A CN 113423156 A CN113423156 A CN 113423156A
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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]
- H05B45/30—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
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a low-dimming-rate quick starting circuit of an LED dimming power supply and a starting method thereof, wherein the low-dimming-rate quick starting method of the LED dimming power supply comprises the following steps of S1: inputting a dimming signal with a low dimming rate to a dimming signal processing circuit during initial starting; step S2: the dimming signal processing circuit converts the input dimming signal to output a PWM signal to the LED drive control circuit, and the output end of the LED drive control circuit outputs a high-frequency switching signal voltage to drive the LED drive circuit, so that the LED drive circuit lights the LED lamp. According to the LED dimming power supply low-dimming-rate quick starting circuit and the starting method thereof, the LED dimming driving power supply is quick in starting time at low dimming rate, namely low-brightness dimming, and the problems that the LED power supply without stroboscopic interference is output by low ripple current and the starting time is slow at low brightness are solved.
Description
Technical Field
The invention belongs to the technical field of LED lamp starting, and particularly relates to a low-dimming-rate quick starting method and a low-dimming-rate quick starting circuit of an LED dimming power supply.
Background
In the design of the LED driving dimming scheme, a PWM chopping dimming mode is mostly adopted, but the ripple current of an LED lamp is very large, and some of the ripple current are square wave current, so that the service life of the LED lamp bead is shortened, serious stroboflash is generated, and other work of equipment such as code scanning or monitoring is interfered. Considering that in order to prolong the service life of the LED lamp bead and reduce the stroboscopic interference of LED light, the output end of the LED driving power supply must adopt a large-capacity electrolytic capacitor, square wave pulsating direct current output by the power supply converter is filtered into direct current with very small smooth ripple current, and the LED lamp is driven to be lighted. However, when the dimming rate of the LED driving power supply is low, the duty ratio of the square-wave pulsating dc power output by the power converter is very small when the LED is turned on, and the time period from charging the output-end large-capacity electrolytic capacitor to LED lighting is very long, especially when the dimming brightness is 1%, the starting time of the lighting at the time of starting is much longer than the starting time of full brightness, and the smaller the ripple current of the LED lamp is, the larger the required filtering electrolytic capacity is, and the longer the starting time is.
Therefore, the invention is how to realize the quick start and lighting of the LED driving dimming power supply when the LED driving dimming power supply is started at low dimming rate, namely low dimming brightness and low signal.
Disclosure of Invention
The invention mainly aims to provide a low-dimming-rate quick start circuit and a start method of an LED dimming power supply, wherein the LED dimming driving power supply has quick start time at low dimming rate, namely low-brightness dimming, so that the problems of low ripple current output, no stroboscopic interference, low start time at low brightness, and particularly the problem of overlarge start time difference between 2-way start of the dimming and dimming power supply and 3-way start application of an RGB dimming power supply are solved.
In order to achieve the above object, the present invention provides a low dimming rate fast start method for an LED dimming power supply, which is used for fast start to light an LED lamp, and comprises the following steps:
step S1: inputting a dimming signal with a low dimming rate (corresponding to the lowest voltage capable of starting the LED lamp) to a dimming signal processing circuit at the initial start;
step S2: the dimming signal processing circuit is used for converting the input dimming signal to output a PWM signal to the LED driving control circuit, and the output end of the LED driving control circuit outputs a high-frequency switching signal voltage to drive the LED driving circuit, so that the LED driving circuit lights an LED lamp;
step S3: the LED + voltage sampling circuit and the LED-voltage sampling circuit respectively perform voltage sampling on the LED lamp to obtain an LED + voltage signal and an LED-voltage signal, and the LED + voltage signal and the LED-voltage signal are respectively input into the dimming signal processing circuit;
step S4: according to the VI characteristic that the voltage is lower when the current of the LED lamp is smaller, the dimming signal processing circuit performs voltage calculation on the LED + voltage signal and the LED-voltage signal to obtain the lowest voltage for starting the LED lamp and memorizes and stores the voltage parameter of the LED lamp;
step S5: when any action (namely, inputting a dimming signal) is carried out after the initial start, the dimming signal processing circuit outputs a high dimming rate (which is matched with the specification of the capacitor EC1 and is a required value corresponding to the time when the LED lamp is quickly lightened) to the LED drive control circuit, so that the LED drive control circuit drives the LED drive circuit and charges the capacitor EC1 connected to the LED lamp with a large current (which is matched with the high dimming rate), the LED lamp is quickly lightened, and when the dimming signal processing circuit detects that the voltage of the LED lamp reaches the voltage parameter memorized by the initial start, a PWM signal with a normal dimming rate is output.
As a more preferable embodiment of the above-mentioned technical means, the step S5 is followed by further comprising:
step S6: the dimming signal processing circuit detects the voltage parameter of the LED lamp when the low dimming rate is started for multiple times and memorizes and stores the voltage parameter, so that the voltage parameter is updated to prevent the voltage parameter from changing when the LED lamp is used for a long time.
As a further preferable technical solution of the above technical solution, when the dimming signal is high, the dimming signal processing circuit outputs a high dimming rate, the duty ratio of the output high frequency switching signal of the LED driving control circuit is large, and the output current of the LED driving circuit is large, so that the charging time for the EC1 is short, and the LED lamp is rapidly turned on;
when the dimming signal is low, the dimming signal processing circuit outputs low dimming rate, the duty ratio of the output high-frequency switching signal of the LED driving control circuit is small, and the output current of the LED driving circuit is small, so that the EC1 is charged for a long time, and the LED lamp is slowly lightened.
In order to achieve the above object, the present invention further provides a low dimming rate fast start circuit of an LED dimming power supply for implementing the low dimming rate fast start method of the LED dimming power supply, including a dimming signal processing circuit, an LED driving control circuit, an LED driving circuit, an LED + voltage sampling circuit, and an LED-voltage sampling circuit, wherein:
inputting a dimming signal with a low dimming rate (corresponding to the lowest voltage capable of starting the LED lamp) to a dimming signal processing circuit at the initial start;
the dimming signal processing circuit is used for converting the input dimming signal to output a PWM signal to the LED driving control circuit, and the output end of the LED driving control circuit outputs a high-frequency switching signal voltage to drive the LED driving circuit, so that the LED driving circuit lights an LED lamp;
the LED + voltage sampling circuit and the LED-voltage sampling circuit respectively perform voltage sampling on the LED lamp to obtain an LED + voltage signal and an LED-voltage signal, and the LED + voltage signal and the LED-voltage signal are respectively input into the dimming signal processing circuit;
according to the VI characteristic that the voltage is lower when the current of the LED lamp is smaller, the dimming signal processing circuit performs voltage calculation on the LED + voltage signal and the LED-voltage signal to obtain the lowest voltage for starting the LED lamp and memorizes and stores the voltage parameter of the LED lamp;
when any action (namely, inputting a dimming signal) is carried out after the initial start, the dimming signal processing circuit outputs a high dimming rate (which is matched with the specification of the capacitor EC1 and is a required value corresponding to the time when the LED lamp is quickly lightened) to the LED drive control circuit, so that the LED drive control circuit drives the LED drive circuit and charges the capacitor EC1 connected to the LED lamp with a large current (which is matched with the high dimming rate), the LED lamp is quickly lightened, and when the dimming signal processing circuit detects that the voltage of the LED lamp reaches the voltage parameter memorized by the initial start, a PWM signal with a normal dimming rate is output.
As a further preferable technical solution of the above technical solution, one end of the LED + voltage sampling circuit is electrically connected to the anode of the LED lamp and the other end of the LED + voltage sampling circuit is electrically connected to the dimming signal processing circuit, one end of the LED-voltage sampling circuit is electrically connected to the cathode of the LED lamp and the other end of the LED-voltage sampling circuit is electrically connected to the dimming signal processing circuit.
Drawings
Fig. 1 is a schematic structural diagram of a low dimming rate fast start circuit of an LED dimming power supply and a start method thereof according to the present invention.
Fig. 2 is a circuit diagram of a low dimming rate fast start circuit of an LED dimming power supply and a start method thereof according to the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
In the preferred embodiment of the present invention, those skilled in the art should note that the LED lamp, the resistor, the capacitor, and the like, which are referred to in the present invention, can be regarded as the prior art.
PREFERRED EMBODIMENTS
The invention discloses a low-dimming-rate quick starting method of an LED dimming power supply, which is used for quickly starting to light an LED lamp and comprises the following steps:
step S1: inputting a dimming signal with a low dimming rate (corresponding to the lowest voltage capable of starting the LED lamp) to a dimming signal processing circuit at the initial start;
step S2: the dimming signal processing circuit is used for converting the input dimming signal to output a PWM signal to the LED driving control circuit, and the output end of the LED driving control circuit outputs a high-frequency switching signal voltage to drive the LED driving circuit, so that the LED driving circuit lights an LED lamp;
step S3: the LED + voltage sampling circuit and the LED-voltage sampling circuit respectively perform voltage sampling on the LED lamp to obtain an LED + voltage signal and an LED-voltage signal, and the LED + voltage signal and the LED-voltage signal are respectively input into the dimming signal processing circuit;
step S4: according to the VI characteristic that the voltage is lower when the current of the LED lamp is smaller, the dimming signal processing circuit performs voltage calculation on the LED + voltage signal and the LED-voltage signal to obtain the lowest voltage for starting the LED lamp and memorizes and stores the voltage parameter of the LED lamp;
step S5: when any action (namely, inputting a dimming signal) is carried out after the initial start, the dimming signal processing circuit outputs a high dimming rate (which is matched with the specification of the capacitor EC1 and is a required value corresponding to the time when the LED lamp is quickly lightened) to the LED drive control circuit, so that the LED drive control circuit drives the LED drive circuit and charges the capacitor EC1 connected to the LED lamp with a large current (which is matched with the high dimming rate), the LED lamp is quickly lightened, and when the dimming signal processing circuit detects that the voltage of the LED lamp reaches the voltage parameter memorized by the initial start, a PWM signal with a normal dimming rate is output.
Specifically, step S5 is followed by:
step S6: the dimming signal processing circuit detects the voltage parameter of the LED lamp when the low dimming rate is started for multiple times and memorizes and stores the voltage parameter, so that the voltage parameter is updated to prevent the voltage parameter from changing when the LED lamp is used for a long time.
More specifically, when the dimming signal is high, the dimming signal processing circuit outputs a high dimming rate, the duty ratio of the output high-frequency switching signal of the LED driving control circuit is large, and the output current of the LED driving circuit is large, so that the charging time of the EC1 is short, and the LED lamp is rapidly turned on;
when the dimming signal is low, the dimming signal processing circuit outputs low dimming rate, the duty ratio of the output high-frequency switching signal of the LED driving control circuit is small, and the output current of the LED driving circuit is small, so that the EC1 is charged for a long time, and the LED lamp is slowly lightened.
It should be noted that the terms "high", "low", "large", "small", "long", "short", "fast" and "slow" are all determined based on the lighting time of the existing LED lamp.
The invention also discloses a low-dimming-rate quick start circuit of the LED dimming power supply, which is used for implementing the low-dimming-rate quick start method of the LED dimming power supply, and the low-dimming-rate quick start circuit comprises a dimming signal processing circuit, an LED driving control circuit, an LED driving circuit, an LED + voltage sampling circuit and an LED-voltage sampling circuit, wherein:
inputting a dimming signal with a low dimming rate (corresponding to the lowest voltage capable of starting the LED lamp) to a dimming signal processing circuit at the initial start;
the dimming signal processing circuit is used for converting the input dimming signal to output a PWM signal to the LED driving control circuit, and the output end of the LED driving control circuit outputs a high-frequency switching signal voltage to drive the LED driving circuit, so that the LED driving circuit lights an LED lamp;
the LED + voltage sampling circuit and the LED-voltage sampling circuit respectively perform voltage sampling on the LED lamp to obtain an LED + voltage signal and an LED-voltage signal, and the LED + voltage signal and the LED-voltage signal are respectively input into the dimming signal processing circuit;
according to the VI characteristic that the voltage is lower when the current of the LED lamp is smaller, the dimming signal processing circuit performs voltage calculation on the LED + voltage signal and the LED-voltage signal to obtain the lowest voltage for starting the LED lamp and memorizes and stores the voltage parameter of the LED lamp;
when any action (namely, inputting a dimming signal) is carried out after the initial start, the dimming signal processing circuit outputs a high dimming rate (which is matched with the specification of the capacitor EC1 and is a required value corresponding to the time when the LED lamp is quickly lightened) to the LED drive control circuit, so that the LED drive control circuit drives the LED drive circuit and charges the capacitor EC1 connected to the LED lamp with a large current (which is matched with the high dimming rate), the LED lamp is quickly lightened, and when the dimming signal processing circuit detects that the voltage of the LED lamp reaches the voltage parameter memorized by the initial start, a PWM signal with a normal dimming rate is output.
Specifically, one end of the LED + voltage sampling circuit is electrically connected with the anode of the LED lamp, the other end of the LED + voltage sampling circuit is electrically connected with the dimming signal processing circuit, one end of the LED-voltage sampling circuit is electrically connected with the cathode of the LED lamp, and the other end of the LED-voltage sampling circuit is electrically connected with the dimming signal processing circuit.
The invention also discloses a low-dimming-rate quick start circuit of the LED dimming power supply, which is used for adjusting the LED and comprises a dimming signal processing circuit, an LED driving control circuit, an LED driving circuit, an auxiliary power supply circuit, an LED + voltage sampling circuit and an LED-voltage sampling circuit, wherein:
the auxiliary power supply circuit is electrically connected with the dimming signal processing circuit, the LED drive control circuit and the LED drive circuit respectively;
the input end of the dimming signal processing circuit is electrically connected with the dimming signal, and the output end of the dimming signal processing circuit is electrically connected with the input end of the LED drive control circuit;
the output end of the LED driving control circuit is electrically connected to the input end of the LED driving circuit (only one PWM signal is provided, so in fig. 2, any one of the PWM signals of U4 is connected, and it is not necessary to start the LED driving circuit by two high and low PWMs), and the output end of the LED driving circuit is electrically connected to the LED lamp by a capacitor EC 1;
one end of the LED + voltage sampling circuit is electrically connected with the anode of the LED lamp, the other end of the LED + voltage sampling circuit is electrically connected with the dimming signal processing circuit, one end of the LED-voltage sampling circuit is electrically connected with the cathode of the LED lamp, and the other end of the LED-voltage sampling circuit is electrically connected with the dimming signal processing circuit.
Specifically, the dimming signal processing circuit comprises a processing chip U3, wherein 3 pins of the processing chip U3 are electrically connected with 1 pin of the dimming signal through a resistor R2, and 4 pins of the processing chip U3 are electrically connected with 2 pins of the dimming signal through a resistor R3;
the LED driving control circuit comprises a driving chip U4, wherein a 2 pin of the driving chip U4 is electrically connected with a 5 pin of the processing chip U3 through a resistor R7, a 3 pin of the driving chip U4 is electrically connected with a 6 pin of the processing chip U3 through a resistor R8, the 3 pin of the driving chip U4 is grounded through a capacitor C13, and two ends of the capacitor C13 are connected with a resistor R12 in parallel.
More specifically, the LED driving circuit includes a field effect transistor Q1, a diode D3, an inductor L3 and a capacitor EC4, an 8 pin of the driving chip U4 is electrically connected to a gate of the field effect transistor Q1 through a resistor R15, a 6 pin of the driving chip U4 is electrically connected to a source of the field effect transistor Q1 through a resistor R17, a 5 pin of the driving chip U4 is electrically connected to a drain of the field effect transistor Q1 through a resistor R16 and a capacitor C18, a resistor R18 is connected between the gate and the source of the field effect transistor Q1, and the source of the field effect transistor Q1 is also grounded through a resistor R19.
Furthermore, one path of the drain of the field effect transistor Q1 is electrically connected with the cathode of the LED lamp through the inductor L3, the other path of the drain of the field effect transistor Q1 is electrically connected with the anode of the LED lamp through the diode D3, the capacitor EC4 is further connected between the anode and the cathode of the LED lamp, and the anode of the LED lamp is further connected with a direct current input.
Further, the auxiliary power supply circuit comprises a power chip U1 and a power chip U2, wherein:
a 5 pin of the power chip U1 is connected with direct current input through a resistor R13, a 2 pin of the power chip U1 is electrically connected with a 1 pin of the power chip U2 through a resistor R6 and a diode D1 in turn, a 4 pin of the power chip U1 is electrically connected with a 1 pin of the driving chip U4 through an inductor L2 and a resistor R10, a capacitor C10 is connected between the 2 pin and the 4 pin (connected with a 3 pin) of the power chip U1, two ends of the capacitor C10 are connected with a resistor R9 in parallel, a common connection end of the diode D1 and the resistor R6 is grounded through a capacitor C9 and a diode D2 in turn, and a common connection end of the capacitor C9 and the diode D2 is electrically connected with a 4 pin of the power chip U1;
the 4-pin difference of the power chip U2 is electrically connected with the 1-pin of the processing chip U3 through a capacitor C4 and an inductor L1, one end of the capacitor L1, which is far away from the power chip U2, is also grounded through a capacitor EC3, the 6-pin of the power chip U2 is electrically connected with the 1-pin of the processing chip U3 through a resistor R5 and a resistor R1 in sequence, the common end of the resistor R1 and the resistor R5 is grounded through a resistor R4, and two ends of the resistor R1 are connected with the capacitor C1 in parallel.
Preferably, the LED + voltage sampling circuit includes a resistor R20, a resistor R21, and a capacitor C21, one end of the resistor R20 is electrically connected to the anode of the LED lamp, and one end of the resistor R20 away from the LED lamp is grounded through the resistor R21, one end of the resistor R20 away from the LED lamp is also grounded through the capacitor C21, and one end of the resistor R20 away from the LED lamp is also electrically connected to the 7 pin of the processing chip U3 through a resistor R22;
the LED-voltage sampling circuit comprises a resistor R23, a resistor R24 and a capacitor C22, one end of the resistor R23 is electrically connected with the negative electrode of the LED lamp, the resistor R23 is far away from one end of the LED lamp and is grounded through the resistor R24, one end of the resistor R23, far away from the LED lamp, is also grounded through the capacitor C22, and one end of the resistor R23, far away from the LED lamp, is also electrically connected with the 8-pin of the processing chip U3 through a resistor R25.
Preferably, the model of the power chip U1 includes but is not limited to MP172GJ, the model of the power chip U2 includes but is not limited to MP2317GJ, the model of the processing chip U3 includes but is not limited to CX32L003F8P6T, and the model of the driving chip U4 includes but is not limited to OB3375 CPA.
The principle of the invention is as follows:
when the LED lamp is started for the first time, the dimming signal processing circuit processes and converts an input dimming signal, then the dimming signal is input into the LED driving control circuit, and the LED driving control circuit outputs a high-frequency switching signal voltage to control the LED driving circuit to light the LED. When the dimming signal is large, namely the dimming rate is high, the duty ratio of the output high-frequency switching signal of the LED driving control circuit is large, the time for charging the EC1 by the large output current of the LED driving circuit is short, and the LED is rapidly lightened. When the dimming signal is very small and the dimming rate is low, the duty ratio of the output high-frequency switching signal of the LED driving control circuit is very small, the time for the LED driving circuit to output very small current to charge the capacitor EC1 becomes very long, and the LED lights slowly.
After the LED lamp is started, the LED + and LED-voltage sampling circuit inputs the sampled voltage signal of the LED lamp to the dimming signal control circuit, and the dimming signal control circuit determines the voltage of the LED lamp by calculating the signal voltage of the LED + and the LED-. The voltage is lower as the VI characteristic current of the LED lamp bead is smaller, so that the LED lamp bead is started at a low dimming rate when being started for the first time, the voltage of the LED lamp is the lowest, and the dimming signal control circuit calculates and memorizes and stores the voltage parameters of the LED lamp by the signal voltage of the LED + and the LED-.
And when the LED is started up again at any dimming rate at any time later, the dimming signal control circuit outputs a dimming signal with a larger dimming rate to the LED drive control circuit to drive the LED drive circuit to charge the EC1 with a large current at the initial starting up stage, the LED lamp is quickly lightened, and when the dimming signal control circuit detects that the LED voltage reaches the voltage parameter memorized in the initial starting up stage, the dimming signal with the normal dimming rate is output.
In the subsequent lighting process, if the dimming signal control circuit detects the voltage parameter of the LED lamp at the low dimming rate at all times and stores the updating parameter, the voltage parameter of the LED lamp is prevented from changing after the LED lamp is used for a long time.
It should be noted that the technical features of the LED lamp, the resistor, the capacitor, and the like related to the present patent application should be regarded as the prior art, and the specific structure, the operation principle, the control manner and the spatial arrangement manner of the technical features may be selected conventionally in the field, and should not be regarded as the invention point of the present patent, and the present patent is not further specifically described in detail.
It will be apparent to those skilled in the art that modifications and equivalents may be made in the embodiments and/or portions thereof without departing from the spirit and scope of the present invention.
Claims (5)
1. A low dimming rate quick start method of an LED dimming power supply is used for quick start to light an LED lamp and is characterized by comprising the following steps:
step S1: inputting a dimming signal with a low dimming rate to a dimming signal processing circuit during initial starting;
step S2: the dimming signal processing circuit is used for converting the input dimming signal to output a PWM signal to the LED driving control circuit, and the output end of the LED driving control circuit outputs a high-frequency switching signal voltage to drive the LED driving circuit, so that the LED driving circuit lights an LED lamp;
step S3: the LED + voltage sampling circuit and the LED-voltage sampling circuit respectively perform voltage sampling on the LED lamp to obtain an LED + voltage signal and an LED-voltage signal, and the LED + voltage signal and the LED-voltage signal are respectively input into the dimming signal processing circuit;
step S4: according to the VI characteristic that the voltage is lower when the current of the LED lamp is smaller, the dimming signal processing circuit performs voltage calculation on the LED + voltage signal and the LED-voltage signal to obtain the lowest voltage for starting the LED lamp and memorizes and stores the voltage parameter of the LED lamp;
step S5: when any action is performed after the initial starting, the dimming signal processing circuit outputs high dimming rate to the LED driving control circuit, so that the LED driving control circuit drives the LED driving circuit and charges a capacitor EC1 connected to the LED lamp with large current, the LED lamp is quickly lightened, and when the dimming signal processing circuit detects that the voltage of the LED lamp reaches the voltage parameter memorized by the initial starting, a PWM signal with normal dimming rate is output.
2. The low-dimming-rate quick start method for the LED dimming power supply according to claim 1, further comprising after the step S5:
step S6: the dimming signal processing circuit detects the voltage parameter of the LED lamp when the low dimming rate is started for multiple times and memorizes and stores the voltage parameter, so that the voltage parameter is updated to prevent the voltage parameter from changing when the LED lamp is used for a long time.
3. The LED dimming power supply low-dimming-rate quick start method according to claim 1, characterized in that when the dimming signal is high, the dimming signal processing circuit outputs high dimming rate, the duty ratio of the output high-frequency switching signal of the LED drive control circuit is large, the output current of the LED drive circuit is large, so that the charging time of EC1 is short, and the LED lamp is quickly lighted;
when the dimming signal is low, the dimming signal processing circuit outputs low dimming rate, the duty ratio of the output high-frequency switching signal of the LED driving control circuit is small, and the output current of the LED driving circuit is small, so that the EC1 is charged for a long time, and the LED lamp is slowly lightened.
4. An LED dimming power supply low dimming rate fast start circuit for implementing the LED dimming power supply low dimming rate fast start method according to any one of claims 1 to 3, comprising a dimming signal processing circuit, an LED driving control circuit, an LED driving circuit, an LED + voltage sampling circuit and an LED-voltage sampling circuit, wherein:
inputting a dimming signal with a low dimming rate to a dimming signal processing circuit during initial starting;
the dimming signal processing circuit is used for converting the input dimming signal to output a PWM signal to the LED driving control circuit, and the output end of the LED driving control circuit outputs a high-frequency switching signal voltage to drive the LED driving circuit, so that the LED driving circuit lights an LED lamp;
the LED + voltage sampling circuit and the LED-voltage sampling circuit respectively perform voltage sampling on the LED lamp to obtain an LED + voltage signal and an LED-voltage signal, and the LED + voltage signal and the LED-voltage signal are respectively input into the dimming signal processing circuit;
according to the VI characteristic that the voltage is lower when the current of the LED lamp is smaller, the dimming signal processing circuit performs voltage calculation on the LED + voltage signal and the LED-voltage signal to obtain the lowest voltage for starting the LED lamp and memorizes and stores the voltage parameter of the LED lamp;
when any action is performed after the initial starting, the dimming signal processing circuit outputs high dimming rate to the LED driving control circuit, so that the LED driving control circuit drives the LED driving circuit and charges a capacitor EC1 connected to the LED lamp with large current, the LED lamp is quickly lightened, and when the dimming signal processing circuit detects that the voltage of the LED lamp reaches the voltage parameter memorized by the initial starting, a PWM signal with normal dimming rate is output.
5. The LED dimming power supply low-dimming-rate quick start circuit as claimed in claim 4, wherein one end of the LED + voltage sampling circuit is electrically connected with the anode of the LED lamp and the other end of the LED + voltage sampling circuit is electrically connected with the dimming signal processing circuit, one end of the LED-voltage sampling circuit is electrically connected with the cathode of the LED lamp and the other end of the LED-voltage sampling circuit is electrically connected with the dimming signal processing circuit.
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