An all-in-one light emitting diode dimming circuit

Abstract

The present invention provides an all-in-one light-emitting diode dimming circuit, comprising: a first dimming receiving module, which performs voltage reduction processing on a first dimming signal to obtain a level signal; a second dimming receiving module, which obtains a second dimming signal from a host computer, and outputs the second dimming signal in the form of a rated high level and a rated low level change; a dimming processor, which converts the first dimming signal into a first pulse width modulation signal and outputs it, and converts the second dimming signal into a second pulse width modulation signal; a driving power supply module, which receives the first pulse width modulation signal or the second pulse width modulation signal to output a dimming signal, and then controls the lamp load to achieve dimming. The beneficial effect is that the first dimming signal is converted into a first pulse width modulation signal, and the second dimming signal is converted into a second pulse width modulation signal to perform dimming operation on the lamp load, thereby improving the compatibility of the dimming circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of light emitting diode driving, and in particular to an all-in-one light emitting diode dimming circuit. Background Art

[0002] At present, most LED-based lamps provide dimming functions to meet users' different lighting needs. Light adjustment methods are mainly divided into traditional dimming and second dimming. Traditional dimming includes 0 / 1-10V dimming, resistor dimming and pulse width modulation dimming. No matter which dimming method is used, it is necessary to equip the corresponding driving power supply and lamp load that are compatible with the dimmer. Users cannot control the dimming of lamps using the traditional dimming method through the second dimming signal. Similarly, they cannot control the dimming of lamps using the second dimming method through the first dimming signal. There are defects such as poor adaptability and compatibility of lamps.

[0003] In addition, the driving power supplies used for lamps with dimming include constant current power supplies and constant voltage power supplies, while the dimming signal generated by the dimmer is often only applicable to the constant current driving power supply or the constant voltage driving power supply, which has the defect of low adaptability to the dimmer. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides an all-in-one light emitting diode dimming circuit, comprising:

[0005] A first dimming receiving module, used for acquiring a first dimming signal, and performing voltage reduction processing on the first dimming signal to obtain a level signal;

[0006] The second dimming receiving module is connected to a host computer and includes:

[0007] A collection unit, used for acquiring a second dimming signal according to the host computer;

[0008] A processing unit, connected to the acquisition unit, and configured to output the second dimming signal in the form of a rated high level and a rated low level;

[0009] a dimming processor, connected to the first dimming receiving module and the second dimming receiving module respectively, and configured to convert the first dimming signal into a corresponding first pulse width modulation signal and output the first dimming signal when receiving the first dimming signal, and to calculate and convert the second dimming signal into a corresponding second pulse width modulation signal when receiving the second dimming signal;

[0010] A switch module, wherein when the switch module is turned on, the switch module outputs the switching signal of a low level, and the dimming processor switches to the second dimming mode accordingly; when the switch module is not turned on, the switch module outputs the switching signal of a high level, and the dimming processor switches to the first dimming mode;

[0011] a communication module, connected to the second dimming receiving module and the dimming processor, respectively, and configured to send the second dimming signal to the dimming processor;

[0012] The driving power supply module is respectively connected to the dimming processor and a lamp load, and is used to receive the first pulse width modulation signal or the second pulse width modulation signal to output a dimming signal, thereby controlling the lamp load to achieve dimming.

[0013] Preferably, the dimming processor includes:

[0014] a switching unit, configured to switch to a first dimming mode or a second dimming mode according to a switching signal,

[0015] a first analyzing unit, connected to the switching unit, configured to receive the first dimming signal and analyze it to obtain the corresponding first pulse width modulation signal when the analyzing unit switches to the first dimming mode;

[0016] A second analysis unit is connected to the switching unit, and is used to receive the second dimming signal when the analysis unit is switched to the second dimming mode, and convert the second dimming signal into a dimming value, and calculate the corresponding second pulse width modulation signal according to the dimming value.

[0017] Preferably, the first analysis unit is preset with a dimming parameter table, the first dimming signal corresponds to a duty cycle in the dimming parameter table, and the first analysis unit generates and outputs the corresponding first pulse width modulation signal according to the duty cycle.

[0018] Preferably, it also includes a detection module, which is respectively connected to the driving power module and the dimming processor, and is used to obtain a feedback signal according to a driving signal output by the driving power module. When the feedback signal is not less than a preset feedback threshold, the dimming processor outputs an alarm signal to prompt that the lamp load is in a fault state.

[0019] Preferably, the communication module includes:

[0020] A first communication unit, configured to send the second dimming signal acquired by the acquisition unit to the dimming processor;

[0021] The second communication unit is used to control the acquisition unit to stop receiving the second dimming signal according to the feedback signal.

[0022] Preferably, the first dimming signal includes: a 0 / 1-10V dimming signal, a resistance adjustment signal and a pulse width modulation signal.

[0023] Preferably, the first dimming receiving module includes a power supply unit, the power supply unit is connected to a dimmer, and the power supply unit is used to provide electrical energy to the dimmer to drive the dimmer to output the first dimming signal.

[0024] Preferably, the switch module is a dip switch, and a user manually controls the dip switch to be turned on or off.

[0025] The above technical solution has the following advantages or beneficial effects:

[0026] (1) The dimming processor receives the first dimming signal and the second dimming signal respectively, and the dimming processor automatically identifies the input first dimming signal and the second dimming signal, and converts the first dimming signal into a first pulse width modulation signal and the second dimming signal into a second pulse width modulation signal respectively. The driving power supply dims the lamp load according to the converted first pulse width modulation signal or the second pulse width modulation signal, thereby improving the compatibility of the lamp with different dimming signals.

[0027] (2) The first pulse width modulation signal and the second pulse width modulation signal output by the dimming processor are both suitable for constant voltage driving power supply and constant current driving power supply. For the constant current driving power supply, the dimming processor uses a pulse width modulation generation algorithm to make the output current change rate a constant. On the one hand, the lighting effect of the lamp conforms to the visual characteristics of the human eye, which improves the user experience when using the lamp; on the other hand, the compatibility of the dimmer and the constant voltage driving power supply, and the dimmer and the constant current driving power supply is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The control principle diagram of the all-in-one light emitting diode dimming circuit in the preferred embodiment of the present invention;

[0029] Figure 2 A dimming curve diagram of a first dimming signal in a preferred embodiment of the present invention;

[0030] Figure 3 A circuit schematic diagram of a first dimming receiving circuit in a preferred embodiment of the present invention;

[0031] Figure 4 A circuit schematic diagram of a second dimming receiving circuit in a preferred embodiment of the present invention;

[0032] Figure 5 This is a circuit schematic diagram of a dimming processor and peripheral circuits in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment, and other embodiments may also fall within the scope of the present invention as long as they conform to the gist of the present invention.

[0034] In a preferred embodiment of the present invention, based on the above problems existing in the prior art, an all-in-one light emitting diode dimming circuit is provided. Figures 1 to 5 As shown, including:

[0035] The first dimming receiving module 1 is used to obtain a first dimming signal and perform voltage reduction processing on the first dimming signal to obtain a level signal;

[0036] The second dimming receiving module 2 is connected to a host computer 3 and includes:

[0037] The acquisition unit 21 is used to obtain a second dimming signal according to the host computer 3;

[0038] The processing unit 22 is connected to the acquisition unit 21 and is used to output the second dimming signal in the form of a rated high level and a rated low level change;

[0039] The dimming processor 4 is connected to the first dimming receiving module 1 and the second dimming receiving module 2 respectively, and is used to convert the first dimming signal into a corresponding first pulse width modulation signal and output it when receiving the first dimming signal. When receiving the second dimming signal, the dimming processor 4 calculates the second dimming signal and converts it into a corresponding second pulse width modulation signal;

[0040] The switch module 8 outputs a low-level switching signal when it is turned on, and the dimming processor 4 switches to the second dimming mode accordingly; the switch module 8 outputs a high-level switching signal when it is not turned on, and the dimming processor 4 switches to the first dimming mode;

[0041] The communication module 5 is connected to the second dimming receiving module 2 and the dimming processor 4 respectively, and is used to send the second dimming signal to the dimming processor 4;

[0042] The driving power module 6 is respectively connected to the dimming processor 4 and a lamp load 7, and is used for receiving the first pulse width modulation signal or the second pulse width modulation signal to output a dimming signal, and then controlling the lamp load 7 to realize dimming.

[0043] In a preferred embodiment of the present invention, the first dimming signal includes: a 0 / 1-10V dimming signal, a resistance adjustment signal and a pulse width modulation signal.

[0044] Specifically, in this embodiment, the first dimming signal received by the first dimming receiving module 1 includes a 0 / 1-10V dimming signal, a resistance dimming signal, and a pulse width modulation dimming signal; the second dimming receiving module 2 receives a second dimming signal sent by the host computer 3.

[0045] Since the second dimming signal sent by the host computer 3 corresponds to the high level range of 9.5V-22.5V and the low level range of -6.5V-6.5V, the dimming processor 4 cannot directly identify the second dimming signal. Through the second dimming receiving module 2, the level value within the high level range is converted into a rated high level, and the level value within the low level range is converted into a rated low level, which is convenient for the dimming processor 4 to identify the second dimming signal and output the corresponding second pulse width modulation signal according to the second dimming signal.

[0046] When the dimming processor 4 receives a level signal, it outputs a corresponding first pulse width modulation signal according to the level signal, and controls the driving power module 6 to drive the lamp load 7 for dimming through the first pulse width modulation signal; when the dimming processor 4 receives a second dimming signal, it outputs a corresponding second pulse width modulation signal according to the second dimming signal, and controls the driving power module 6 to drive the lamp load 7 for dimming through the second pulse width modulation signal.

[0047] In a preferred embodiment of the present invention, the first dimming receiving module 1 includes a power supply unit 11, which is connected to a dimmer 12. The power supply unit 11 is used to provide electrical energy to the dimmer 12 to drive the dimmer 12 to output a first dimming signal.

[0048] Specifically, in this embodiment, the first dimming receiving module 1 includes a first power supply circuit for supplying power to the dimming processor 4, a second power supply circuit for supplying power to a dimmer 12, a reference circuit for generating a reference signal, and a step-down circuit for stepping down the first dimming signal to generate a level signal, and the second power supply circuit is the energy supply unit 11. Among them, the dimmer 12 is various types of dimmers 12 for generating 0 / 1-10V dimming signals, resistance dimming signals, and pulse width modulation dimming signals, respectively.

[0049] The first power supply circuit includes a chip U2, a capacitor C4, and a capacitor C1, wherein the chip U2 is selected as H6900.

[0050] Pin 3 of chip U2 is respectively connected to 12V DC and one end of capacitor C4, the other end of capacitor C4 is grounded, pin 2 of chip U2 is grounded, pin 1 of chip U2 is respectively connected to one end of capacitor C1 and the power input end of dimming processor 4, the other end of capacitor C1 is grounded.

[0051] The reference circuit includes a three-terminal voltage regulator U3, a resistor R10, and a capacitor C7.

[0052] The input end of the three-terminal voltage regulator U3 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the node between pin 1 of the chip U2 and the capacitor C1, the ground end of the three-terminal voltage regulator U3 is grounded, and the output end of the three-terminal voltage regulator U3 is respectively connected to one end of the capacitor C7 and the reference voltage input end of the second power supply circuit.

[0053] The second power supply circuit includes a voltage comparator U1B, a resistor R12, a resistor R13, a resistor R14, a resistor R15, and a resistor R16.

[0054] Pin 5 of the voltage comparator U1B is respectively connected to one end of the resistor R12 and one end of the resistor R15, the other end of the resistor R12 is connected to the output end of the reference circuit, the other end of the resistor R15 is respectively connected to the resistor R16 and the input end of the step-down circuit, pin 6 of the voltage comparator U1B is respectively connected to one end of the resistor R13 and one end of the resistor R14, the other end of the resistor R13 is grounded, and the other end of the resistor R14 is respectively connected to pin 7 of the voltage comparator U1B and the other end of the resistor R16.

[0055] The step-down circuit includes a voltage-stabilizing diode D2, a resistor R9, a capacitor C6, an operational amplifier U1A, a diode D1, a resistor R6, a resistor R7, a capacitor C3, and a capacitor C2.

[0056] Pin 1 of the operational amplifier U1A is connected to the anode of the diode D1, the cathode of the diode D1 is respectively connected to pin 2 of the operational amplifier U1A and one end of the resistor R6, the other end of the resistor R6 is respectively connected to one end of the resistor R7, one end of the capacitor C3 and the signal input end of the first analysis unit 42 in the dimming processor 4, the other end of the resistor R7 is grounded, the other end of the capacitor C3 is grounded, pin 3 of the operational amplifier U1A is respectively connected to one end of the capacitor C6 and one end of the resistor R9, the other end of the capacitor C6 is grounded, the other end of the resistor R9 is respectively connected to the cathode of the Zener diode D2 and the node between the resistor R16 and the resistor R15, pin 4 of the operational amplifier U1A is grounded, pin 8 of the operational amplifier U1A is respectively connected to the 12V DC and one end of the capacitor C2, the other end of the capacitor C2 is grounded.

[0057] The first dimming receiving circuit also includes a capacitor C5 and a resistor R8. One end of the capacitor C5 is connected to the output end of the dimmer 12 and one end of the resistor R8 respectively. The other end of the resistor R8 is connected to the node between the resistor R16 and the resistor R15. The other end of the capacitor C5 is grounded.

[0058] When the all-in-one light-emitting diode dimming circuit is applied to the first dimming signal to control the dimming of the lamp load 7: the dimmer 12 outputs the first dimming signal under the drive of the second power module, and the first power module outputs a first power signal of 5V and a reference signal of 2.5V respectively, and the step-down circuit compares the reference signal with the first dimming signal of 0-10V. The first dimming signal is converted into a nearly linear 0-5V level signal after step-down processing and output to the dimming processor 4, and the first power signal output by the first power module is used to power the dimming processor 4.

[0059] In a preferred embodiment of the present invention, the switch module 8 includes a dip switch, and a user manually controls the dip switch to be turned on or off.

[0060] Specifically, in this embodiment, the switch module 8 includes a switch S1 and a resistor R19, wherein the switch S1 is a dip switch.

[0061] One end of the switch S1 is grounded, and the other end of the switch S1 is respectively connected to the input end of the switching signal corresponding to the dimming processor 4 and one end of the resistor R19, and the other end of the resistor R19 is connected to the first power signal of 5V.

[0062] When the switch S1 is closed, the switch module 8 is turned on, and the dimming processor 4 receives a low-level switching signal to switch to the second dimming mode; when the switch S1 is opened, the switch module 8 is not turned on, and the dimming processor 4 receives a high-level switching signal to switch to the traditional dimming mode.

[0063] In a preferred embodiment of the present invention, the dimming processor 4 includes:

[0064] The switching unit 41 is used to switch to a first dimming mode or a second dimming mode according to a switching signal.

[0065] A first analyzing unit 42, connected to the switching unit 41, configured to receive the first dimming signal and analyze it to obtain a corresponding first pulse width modulation signal when the analyzing unit is switched to the first dimming mode;

[0066] The second analysis unit 43 is connected to the switching unit 41, and is used for receiving the second dimming signal when the analysis unit is switched to the second dimming mode, converting the second dimming signal into a dimming value, and calculating the corresponding second pulse width modulation signal according to the dimming value.

[0067] Specifically, in this embodiment, the dimming processor 4 is a chip U4, and the chip U4 is AD9834.

[0068] In a preferred embodiment of the present invention, a detection module 9 is also included, which is respectively connected to the driving power module 6 and the dimming processing module, and is used to obtain a feedback signal according to a driving signal output by the driving power module 6. When the feedback signal is not less than a preset feedback threshold, the dimming processing module outputs an alarm signal to prompt that the lamp load 7 is in a fault state.

[0069] Specifically, in this embodiment, the detection module 9 includes a load detection circuit and an overload detection circuit. The load detection circuit obtains the drive signal output by the drive power module 6, converts the drive signal into a corresponding feedback signal, and returns the feedback signal to the dimming processor 4, and the dimming processor 4 determines whether the lamp load 7 has a fault according to the level of the feedback signal.

[0070] The feedback signal corresponding to the load detection circuit is a load signal, and the feedback signal corresponding to the overload detection circuit is an overload signal.

[0071] The load detection circuit includes a voltage comparator U5A, a resistor R93, a resistor R125, a resistor R128, a resistor R129, and a capacitor C73.

[0072] Pin 1 of the voltage comparator U5A is respectively connected to one end of the resistor R125 and one end of the resistor R93, the other end of the resistor R125 is respectively connected to one end of the capacitor C73 and the signal receiving end of the chip U4, the other end of the capacitor C73 is grounded, the other end of the resistor R93 is respectively connected to the first power supply signal and one end of the resistor R129, pin 2 of the voltage comparator U5A is respectively connected to one end of the resistor R128 and the other end of the resistor R129, the other end of the resistor R128 is grounded, pin 3 of the voltage comparator U5A is connected to the drive signal, pin 4 of the voltage comparator U5A is grounded, and pin 8 of the voltage comparator U5A is connected to the first power supply signal.

[0073] After the first power supply signal passes through the resistor R129, it is converted from a current signal into a reference voltage and input into the reverse end of the voltage comparator U5A. The driving signal output by the driving power supply module 6 is input into the non-inverting end of the voltage comparator U5A. When the voltage value of the driving signal is lower than the reference voltage value, the output end of the voltage comparator U5A outputs a low-level load signal; conversely, when the voltage value of the driving signal is higher than the reference voltage value, the load signal is high, and the chip U4 prompts the user that the lamp load 7 is faulty when the load signal is low.

[0074] The overload detection circuit includes a voltage comparator U5B, a resistor R92, a resistor R121, a resistor R122, a resistor R124, a diode D40, a capacitor C71, and a capacitor C72.

[0075] Pin 5 of the voltage comparator U5B is connected to the driving signal, pin 6 of the voltage comparator U5B is respectively connected to one end of the resistor R121 and one end of the resistor R122, the other end of the resistor R121 is grounded, the other end of the resistor R122 is respectively connected to the first power supply signal and one end of the resistor R92, pin 7 of the voltage comparator U5B is respectively connected to the positive electrode of the diode D40 and the other end of the resistor R92, the negative electrode of the diode D40 is respectively connected to one end of the resistor R124 and one end of the capacitor C71, the other end of the resistor R124 is respectively connected to one end of the capacitor C72 and the input end of the chip U4 for obtaining the overload signal, that is, pin 12 of the chip U4, the other end of the capacitor C71 is grounded, and the other end of the capacitor C72 is grounded.

[0076] After the first power supply signal passes through the resistor R122, it is converted from a current signal into a reference voltage and input into the reverse end of the voltage comparator U5B. The driving signal output by the driving power supply module 6 is input into the non-inverting end of the voltage comparator U5B. When the voltage value corresponding to the voltage signal output from the output end of the voltage comparator U5B is greater than the conduction voltage of the diode D40, the diode D40 is broken down and turned on, and the overload detection circuit outputs a high-level overload signal; conversely, when the voltage value corresponding to the voltage signal output from the output end of the voltage comparator U5B is not greater than the conduction voltage of the diode D40, the diode D40 is not turned on, and the overload signal output by the overload detection circuit is a low level. When the overload signal is a high level, the chip U4 prompts the user that the lamp load 7 is at risk of overload.

[0077] In summary, the feedback threshold includes the current threshold corresponding to the load detection circuit and the current threshold corresponding to the overload detection circuit. The current threshold corresponding to the load detection circuit is 330mA, and when the current of the drive signal is lower than 330mA, it is judged as a no-load fault; the current threshold corresponding to the overload detection circuit is 50A, and when the current of the drive signal is higher than 50A, it is judged as a short-circuit fault.

[0078] In a preferred embodiment of the present invention, the communication module 5 includes:

[0079] A first communication unit 51, configured to send the second dimming signal acquired by the acquisition unit 21 to the dimming processor 4;

[0080] The second communication unit 52 is used to control the collection unit 21 to stop receiving the second dimming signal according to the feedback signal.

[0081] Specifically, in this embodiment, the communication module 5 is used to provide a communication channel between the dimming processor 4 and the second dimming receiving module 2, and the second dimming receiving module 2 includes a collection unit 21, a processing unit 22, and a clamping unit for driving the collection unit 21 to stop acquiring the second dimming receiving module 2.

[0082] The input end of the first communication unit 51 is connected to the output end of the processing circuit, the output end of the first communication unit 51 is connected to the input end of the chip U4 for obtaining the second dimming signal, the input end of the second communication unit 52 is connected to the output end of the chip U4 for outputting a stop signal, and the output end of the second communication unit 52 is connected to the input end of the clamping unit.

[0083] The first communication unit 51 includes a light emitting diode P2A and a phototransistor P2B.

[0084] The second communication unit 52 includes a resistor R107, a light emitting diode P1A, a resistor R102, and a phototransistor P1B.

[0085] The positive electrode of the light-emitting diode P2A is connected to the output end of the processing unit 22, the negative electrode of the light-emitting diode P2A is respectively connected to the negative electrode of the voltage-stabilizing diode D20, one end of the capacitor C45, and the positive electrode of the voltage-stabilizing diode D49, the positive electrode of the voltage-stabilizing diode D20 and the other end of the capacitor C45 are grounded, the negative electrode of the voltage-stabilizing diode D49 is respectively connected to one end of the resistor R84 and one end of the capacitor C43, the other end of the capacitor C43 is grounded, and the other end of the resistor R84 is connected to the phototransistor P1B The collector of the phototransistor P1B is respectively connected to the input end of the clamping unit and one end of the resistor R76, the anode of the light-emitting diode P1A is connected to the node of the resistor R102 and the first power supply signal, the other end of the resistor R102 is respectively connected to the 16th foot of the chip U4 and the collector of the phototransistor P2B, the cathode of the light-emitting diode P1A is connected to one end of the resistor R107, the other end of the resistor R107 is connected to the 15th foot of the chip U4, and the emitter of the phototransistor P2B is grounded.

[0086] The acquisition unit 21 includes a rectifier bridge BD1, wherein pin 1 of the rectifier bridge BD1 is respectively connected to one end of the capacitor C35, the input end of the processing unit 22 and the output end of the clamping unit, pin 2 of the rectifier bridge BD1 is connected to the positive electrode of the second dimming signal, pin 3 of the rectifier bridge BD1 is connected to the negative electrode of the second dimming signal, and pin 4 of the rectifier bridge BD1 is grounded.

[0087] When obtaining the second dimming signal, the diode between pin 2 and pin 1 of the rectifier bridge BD1 is forward-conducted, and the diode between pin 3 and pin 1 is forward-conducted; when stopping obtaining the second dimming signal, a high level is input to the output end of the clamping unit, so that the diode between pin 2 and pin 1 of the rectifier bridge BD1 is cut off, and the diode between pin 3 and pin 1 is cut off.

[0088] The processing unit 22 includes a resistor R75 , a transistor Q14 , a transistor Q15 , and a resistor R28 .

[0089] One end of the resistor R75 is respectively connected to pin 1 of the rectifier bridge BD1, the drain of the MOS tube Q12, and the emitter of the transistor Q14, the other end of the resistor R75 is respectively connected to the base of the transistor Q14 and the emitter of the transistor Q15, the collector of the transistor Q14 is respectively connected to one end of the resistor R89 ​​and the base of the transistor Q15, the collector of the transistor Q15 is connected to one end of the resistor R28, the other end of the resistor R28 is connected to the positive electrode of the light-emitting diode P2A, the other end of the resistor R89 ​​is connected to one end of the resistor R79, the other end of the resistor R79 is connected to one end of the resistor R78, the other end of the resistor R78 is connected to one end of the resistor R77, and the other end of the resistor R77 is grounded.

[0090] The clamping unit includes a MOS transistor Q12, a transistor Q13, a resistor R80 and a transistor C41.

[0091] The gate of the MOS tube Q12 is respectively connected to one end of the resistor R80 and the emitter of the transistor Q13, the other end of the resistor R80 is respectively connected to the base of the transistor Q13, one end of the capacitor C41, and the emitter of the phototransistor P1B, the other end of the capacitor C41 is grounded, the collector of the transistor Q13 is grounded, the source of the MOS tube Q12 is grounded, and the drain of the MOS tube Q12 is connected to pin 1 of the rectifier bridge BD1.

[0092] When the chip U4 analyzes the feedback signal and obtains that the lamp load 7 has a short circuit or overload fault, the pin 15 of the chip U4 outputs a stop signal, so that the light-emitting diode P1A is turned on, and the phototransistor P1B receives the stop signal, so that the source and drain of the MOS tube Q12 are turned on, and the level of pin 1 of the rectifier bridge BD1 is pulled up, so that the diode between pin 2 and pin 1 of the rectifier bridge BD1 is turned off, and the diode between pin 3 and pin 1 is turned off, thereby stopping the acquisition of the second dimming signal.

[0093] In a preferred embodiment of the present invention, the first analysis unit 42 presets a dimming parameter table, the first dimming signal corresponds to a duty cycle in the dimming parameter table, and the first analysis unit 42 generates and outputs a corresponding first pulse width modulation signal according to the duty cycle.

[0094] Specifically, in this embodiment, the chip U4 generates a corresponding first pulse width modulation signal according to the duty cycle of the dimming parameter table corresponding to the level value of the first dimming signal.

[0095] By making a dimming curve that conforms to the visual characteristics of the human eye, such as Figure 2As shown, the horizontal axis of the dimming curve is the actual power level, and the vertical axis of the dimming parameter table is the dimming output, so that the output current change rate is constant, so that the lighting effect of the lamp conforms to the visual characteristics of the human eye, and improves the user's experience when using the lamp. The actual power level is calculated and converted from the first dimming signal.

[0096] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of this specification and illustrations should be included in the protection scope of the present invention.

Claims

1. An all-in-one light emitting diode dimming circuit, characterized in that: include: A first dimming receiving module, used for acquiring a first dimming signal, and performing voltage reduction processing on the first dimming signal to obtain a level signal; The second dimming receiving module is connected to a host computer and includes: A collection unit, used for acquiring a second dimming signal according to the host computer; A processing unit, connected to the acquisition unit, and configured to output the second dimming signal in the form of a rated high level and a rated low level; a dimming processor, connected to the first dimming receiving module and the second dimming receiving module respectively, and configured to convert the first dimming signal into a corresponding first pulse width modulation signal and output the first dimming signal when receiving the first dimming signal, and to calculate and convert the second dimming signal into a corresponding second pulse width modulation signal when receiving the second dimming signal; A switch module, wherein when the switch module is turned on, it outputs a low-level switching signal, and the dimming processor switches to the second dimming mode accordingly; when the switch module is not turned on, it outputs a high-level switching signal, and the dimming processor switches to the first dimming mode; a communication module, connected to the second dimming receiving module and the dimming processor, respectively, and configured to send the second dimming signal to the dimming processor; A driving power supply module, connected to the dimming processor and a lamp load respectively, for receiving the first pulse width modulation signal or the second pulse width modulation signal to output a dimming signal, and then controlling the lamp load to achieve dimming; The first dimming receiving module includes a first power supply circuit for supplying power to the dimming processor, a second power supply circuit for supplying power to a dimmer, a reference circuit for generating a reference signal, and a step-down circuit for stepping down the first dimming signal to generate a level signal; The first power supply circuit includes a chip U2, a capacitor C4, and a capacitor C1. Pin 3 of the chip U2 is respectively connected to a 12V DC power supply and one end of the capacitor C4, the other end of the capacitor C4 is grounded, pin 2 of the chip U2 is grounded, pin 1 of the chip U2 is respectively connected to one end of the capacitor C1 and the functional input end of the dimming processor, and the other end of the capacitor C1 is grounded; The reference circuit includes a three-terminal voltage regulator U3, a resistor R10, and a capacitor C7, wherein the input end of the three-terminal voltage regulator U3 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the node between pin 1 of the chip U2 and the capacitor C1, the ground end of the three-terminal voltage regulator U3 is grounded, and the output end of the three-terminal voltage regulator U3 is respectively connected to one end of the capacitor C7 and the reference voltage input end of the second power supply circuit; The second power supply circuit includes a voltage comparator U1B, a resistor R12, a resistor R13, a resistor R14, a resistor R15, and a resistor R16. Pin 5 of the voltage comparator U1B is respectively connected to one end of the resistor R12 and one end of the resistor R15, the other end of the resistor R12 is connected to the output end of the reference circuit, the other end of the resistor R15 is respectively connected to the resistor R16 and the input end of the step-down circuit, pin 6 of the voltage comparator U1B is respectively connected to one end of the resistor R13 and one end of the resistor R14, the other end of the resistor R13 is grounded, and the other end of the resistor R14 is respectively connected to pin 7 of the voltage comparator U1B and the other end of the resistor R16; the step-down circuit includes a voltage regulator diode D2, a resistor R9, a capacitor C6, an operational amplifier U1A, a diode D1, a resistor R6, a resistor R7, a capacitor C3, and a capacitor C2; Pin 1 of the operational amplifier U1A is connected to the anode of the diode D1, the cathode of the diode D1 is respectively connected to pin 2 of the operational amplifier U1A and one end of the resistor R6, the other end of the resistor R6 is respectively connected to one end of the resistor R7, one end of the capacitor C3 and the signal input end of the first analysis unit 42 in the dimming processor 4, the other end of the resistor R7 is grounded, the other end of the capacitor C3 is grounded, pin 3 of the operational amplifier U1A is respectively connected to one end of the capacitor C6 and one end of the resistor R9, the other end of the capacitor C6 is grounded, the other end of the resistor R9 is respectively connected to the cathode of the voltage-stabilizing diode D2 and the node between the resistor R16 and the resistor R15, pin 4 of the operational amplifier U1A is grounded, pin 8 of the operational amplifier U1A is respectively connected to the 12V DC and one end of the capacitor C2, the other end of the capacitor C2 is grounded; The first dimming receiving module also includes a capacitor C5 and a resistor R8, one end of the capacitor C5 is respectively connected to the output end of the dimmer and one end of the resistor R8, the other end of the resistor R8 is connected to the node between the resistor R16 and the resistor R15, and the other end of the capacitor C5 is grounded.

2. The all-in-one light emitting diode dimming circuit according to claim 1, characterized in that: The dimming processor comprises: a switching unit, configured to switch to a first dimming mode or a second dimming mode according to a switching signal, a first analyzing unit, connected to the switching unit, configured to receive the first dimming signal and analyze it to obtain the corresponding first pulse width modulation signal when the analyzing unit switches to the first dimming mode; A second analysis unit is connected to the switching unit, and is used to receive the second dimming signal when the analysis unit is switched to the second dimming mode, and convert the second dimming signal into a dimming value, and calculate the corresponding second pulse width modulation signal according to the dimming value.

3. The all-in-one light emitting diode dimming circuit according to claim 2, characterized in that: The first analysis unit is preset with a dimming parameter table, the first dimming signal corresponds to a duty cycle in the dimming parameter table, and the first analysis unit generates and outputs the corresponding first pulse width modulation signal according to the duty cycle.

4. The all-in-one light emitting diode dimming circuit according to claim 1, characterized in that: It also includes a detection module, which is respectively connected to the driving power module and the dimming processor, and is used to obtain a feedback signal according to a driving signal output by the driving power module. When the feedback signal is not less than a preset feedback threshold, the dimming processor outputs an alarm signal to prompt that the lamp load is in a fault state.

5. The all-in-one light emitting diode dimming circuit according to claim 4, characterized in that: The communication module comprises: A first communication unit, configured to send the second dimming signal acquired by the acquisition unit to the dimming processor; The second communication unit is used to control the acquisition unit to stop receiving the second dimming signal according to the feedback signal.

6. The all-in-one light emitting diode dimming circuit according to claim 1, characterized in that: The first dimming signal includes: a 0 / 1-10V dimming signal, a resistance adjustment signal and a pulse width modulation signal.

7. The all-in-one light emitting diode dimming circuit according to claim 1, characterized in that: The switch module is a dip switch, and a user manually controls the dip switch to be turned on or off.

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