A driving circuit and a lamp

Abstract

The present invention provides a driving circuit, comprising: a bridge rectifier filter module, a constant current drive module, a power adjustment module, a slow start and gradual brightening time adjustable control module, and a rectifier filter output module. The slow start and gradual brightening time adjustable control module generates and outputs a slow start and gradual brightening time adjustable control signal, and the power adjustment module generates and outputs a power adjustment signal; then the constant current drive module adjusts the maximum power threshold of the load current according to the power adjustment signal, and adjusts the conduction angle of the internal MOS tube according to the slow start and gradual brightening time adjustable control signal, so that the load current changes from zero to a maximum value; finally, the rectifier filter output module performs filtering processing on the load current, and provides the filtered load current to the load; thereby realizing the slow start of the load, that is, the slow start and gradual brightening change of the LED lamp, effectively solving the problem of drastic brightness change when the existing LED lighting driver and lamp exist, and the slow start time is adjustable and the load current is adjustable.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a driving circuit and a lamp. Background Art

[0002] In existing LED lighting drivers and lamps, since LED lamp beads have the characteristic of quick start-up after power-on, they light up immediately after turning on, which may cause certain troubles and inconveniences to users in some specific occasions. Typical occasions are as follows:

[0003] One is in nursing homes. When the elderly get up at night to relieve themselves, the LED lighting will instantly turn the indoor environment from dark to bright when the light is turned on. The strong difference in light and dark viewing distances can cause temporary blindness in the elderly. Coupled with the slow mobility of the elderly, it is easy for them to get hurt.

[0004] The second is the hotel conference office space. In some conference rooms, due to the need for conference projection, the conference room lighting is usually turned off during projection to allow people to focus on the projection screen. However, when the lights are turned on at the end of the projection, the instantaneous brightness of the lights will cause discomfort to the human eye, affecting the experience and efficiency of the participants.

[0005] It can be seen that the existing LED lighting drivers and lamps have the problem of drastic brightness changes when starting. Summary of the invention

[0006] The present invention provides a driving circuit and a lamp to solve the problem of drastic brightness changes when the existing LED lighting driving and lamp are started.

[0007] The present invention is implemented in this way: a driving circuit comprises:

[0008] Bridge rectifier filter module, constant current drive module, power adjustment module, slow start and gradual lightening time adjustable control module, rectifier filter output module;

[0009] The first input end of the bridge rectifier filter module is connected to the live wire of the AC power grid, the second input end is connected to the neutral wire of the AC power grid, and the output end is connected to the first input end of the constant current drive module;

[0010] The output end of the constant current driving module is connected to the input end of the rectifying and filtering output module, and the output end of the rectifying and filtering output module is connected to the load;

[0011] The first input end of the slow start and gradual lightening time adjustable control module is connected to the live wire of the AC power grid, the second input end and the third input end are respectively connected to the neutral wire of the AC power grid, and the output end is connected to the second input end of the constant current drive module;

[0012] The output end of the power adjustment module is connected to the third input end of the constant current driving module;

[0013] The bridge rectifier filter module is used to convert the AC signal into a DC signal; the slow start and gradual brightening time adjustable control module is used to collect the power-on signal from the AC signal, and after power-on, output the slow start and gradual brightening time adjustable control signal to the constant current drive module according to the preset gradual brightening time and gradual brightening mode; the power adjustment module is used to generate and output the power adjustment signal;

[0014] The constant current driving module is used to adjust the maximum power threshold of the load current according to the power adjustment signal, and to adjust the conduction angle of the internal MOS tube according to the slow-start and gradually-brightening time adjustable control signal, so that the load current gradually changes from zero to the maximum value; the rectifier and filter output module is used to filter the load current and provide the filtered load current to the load.

[0015] Optionally, the slow start and gradual lightening time adjustable control module includes:

[0016] A first diode, a second diode, a first resistor, a mode control chip, a second resistor, a third resistor, a fourth resistor, a first voltage zener diode, a second voltage zener diode, a first filter capacitor, and a fifth resistor;

[0017] The positive electrode of the first diode is connected to the live wire of the AC power grid, and the positive electrode of the second diode is connected to the neutral wire of the AC power grid;

[0018] The cathode of the first diode and the cathode of the second diode are commonly connected to the first end of the first resistor;

[0019] The first end of the first resistor, the cathode of the first voltage stabilizing diode, and the anode of the first filter capacitor are commonly connected to the power supply terminal of the mode control chip;

[0020] The anode of the first voltage stabilizing diode, the anode of the second voltage stabilizing diode, the cathode of the first filter capacitor and the GND terminal of the mode control chip are connected to the ground;

[0021] The mode end of the mode control chip is connected to the first end of the second resistor;

[0022] The first slow-start time terminal of the mode control chip is connected to the first terminal of the third resistor;

[0023] The second slow-start time terminal of the mode control chip is connected to the first terminal of the fourth resistor;

[0024] The second end of the second resistor, the second end of the third resistor, and the second end of the fourth resistor are connected to the ground;

[0025] The first end of the fifth resistor is connected to the zero line of the AC power grid;

[0026] The second end of the fifth resistor and the cathode of the second voltage stabilizing diode are commonly connected to the clock signal end of the mode control chip;

[0027] The mode control chip includes at least one control signal output terminal.

[0028] Optionally, the constant current driving module is connected to the rectification and filtering output module through a first transformer.

[0029] Optionally, the constant current driving module includes:

[0030] A sixth resistor, a first capacitor, a seventh resistor, a third diode, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third voltage-stabilizing diode, a second capacitor, a fourth diode, a twelfth resistor, a second filter capacitor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third capacitor, a second transformer, and a constant current drive chip;

[0031] The first end of the eighth resistor, the first end of the sixth resistor, the first end of the first capacitor, and the first opposite-name end of the first transformer are commonly connected to the output end of the bridge rectifier and filter module;

[0032] A common point between the second end of the sixth resistor and the second end of the first capacitor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is connected to the cathode of the third diode;

[0033] The anode of the third diode and the first same-name terminal of the first transformer are connected to the driving control terminal of the constant current driving chip;

[0034] The eighth resistor, the ninth resistor and the tenth resistor are connected in series in sequence;

[0035] One end of the tenth resistor, the first end of the eleventh resistor, the first end of the second capacitor, the positive electrode of the second filter capacitor, the first end of the thirteenth resistor, and the negative electrode of the fourth diode are connected to the power supply end of the constant current drive chip;

[0036] The cathode of the third voltage stabilizing diode and the second end of the eleventh resistor are connected to the control signal end of the constant current driving chip, and the control signal end is used to receive the control signal output by the mode control chip;

[0037] The anode of the third voltage stabilizing diode, the second end of the second capacitor, the cathode of the second filter capacitor, and the second end of the thirteenth resistor are connected to the ground;

[0038] The anode of the fourth diode is connected to the first end of the twelfth resistor, and the second end of the twelfth resistor is connected to the first end of the fourteenth resistor and the first same-name end of the second transformer respectively;

[0039] The second end of the fourteenth resistor, the first end of the third capacitor, and the first end of the fifteenth resistor are connected to the feedback voltage input end of the constant current driving chip;

[0040] The second end of the third capacitor, the second end of the fifteenth resistor, and the first opposite-name end of the second transformer are connected to the ground;

[0041] The current sampling end of the constant current driving chip is connected to the output end of the power adjustment module, and the brightness changing end is connected to the first end of the fourth capacitor;

[0042] The second end of the fourth capacitor and the GND end of the constant current driving chip are connected to the ground.

[0043] Optionally, the power adjustment module includes:

[0044] a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a first switch, and a second switch;

[0045] A common point between the first end of the eighteenth resistor and the first end of the first switch and the first end of the second switch serves as an output end of the power adjustment module;

[0046] The second end of the first switch is connected to the first end of the sixteenth resistor;

[0047] The second end of the second switch is connected to the first end of the seventeenth resistor;

[0048] The second end of the sixteenth resistor, the second end of the seventeenth resistor, and the second end of the eighteenth resistor are connected to the ground.

[0049] Optionally, the first switch and the second switch are both dip switches.

[0050] Optionally, the rectification and filtering output module includes:

[0051] a fifth diode, a third filter capacitor, and a nineteenth resistor;

[0052] The anode of the fifth diode is connected to the second same-name terminal of the first transformer;

[0053] A common point between the cathode of the fifth diode, the anode of the third filter capacitor, and the first end of the nineteenth resistor is connected to the anode of the load;

[0054] The second opposite-name terminal of the first transformer, the negative electrode of the third filter capacitor, and the second end of the nineteenth resistor are connected to the ground.

[0055] Optionally, the bridge rectifier and filter module includes:

[0056] Bridge rectifier circuit, fourth filter capacitor, fuse;

[0057] The first end of the bridge rectifier circuit is connected to the live wire of the AC power grid through a fuse, and the second end is connected to the neutral wire of the AC power grid;

[0058] The common point between the third end of the bridge rectifier circuit and the positive electrode of the fourth filter capacitor serves as the output end of the bridge rectifier filter module;

[0059] The fourth terminal of the bridge rectifier circuit and the negative electrode of the fourth filter capacitor are connected to the ground.

[0060] Optionally, the load is an LED lamp.

[0061] A lamp comprises the driving circuit as described above.

[0062] The present invention constructs a power adjustment module and a slow-start and gradually-brightening time adjustable control module, and applies them to a driving circuit. The slow-start and gradually-brightening time adjustable control module collects a power-on signal from an alternating current signal, and after power-on, outputs a slow-start and gradually-brightening time adjustable control signal to a constant current driving module according to a preset gradually-brightening time and a gradually-brightening mode, and generates and outputs a power adjustment signal through the power adjustment module; then the constant current driving module adjusts the maximum power threshold of the load current according to the power adjustment signal, and adjusts the conduction angle of the internal MOS tube according to the slow-start and gradually-brightening time adjustable control signal, so that the load current gradually changes from zero to the maximum value; finally, the rectifier filter output module filters the load current, and provides the filtered load current to the load; thereby realizing the slow start of the load, that is, the slow start and gradually-brightening change of the LED lamp, effectively solving the problem of drastic brightness changes at startup of the existing LED lighting driver and lamp, and the slow-start time is adjustable and the load current is adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0064] Figure 1 is a schematic diagram of a driving circuit provided by an embodiment of the present invention;

[0065] Figure 2 is a schematic diagram of a driving circuit provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0067] The present invention adds a power adjustment module and a slow start and gradually brightening time adjustable control module to the existing driving circuit, collects a power-on signal from an alternating current signal through the slow start and gradually brightening time adjustable control module, outputs a slow start and gradually brightening time adjustable control signal to a constant current driving module according to a preset gradually brightening time and gradually brightening mode after power-on, and generates and outputs a power adjustment signal through the power adjustment module; then the constant current driving module adjusts the maximum power threshold of the load current according to the power adjustment signal, and adjusts the conduction angle of the internal MOS tube according to the slow start and gradually brightening time adjustable control signal, so that the constant current driving module works slowly and outputs a load current that changes from zero to a maximum value; finally, the rectifier filter output module filters the load current, and provides the filtered load current to the load; thereby realizing a slow start of the load, that is, a slow start and gradually brightening change of the LED lamp, effectively solving the problem of drastic brightness changes when the existing LED lighting driver and lamp exist, and the slow start time is adjustable and the load current is adjustable.

[0068] Figure 1 Schematic diagram of a driving circuit provided by an embodiment of the present invention. Figure 1 As shown, the driving circuit includes:

[0069] A bridge rectifier filter module 10, a constant current drive module 20, a power adjustment module 30, a slow start and gradual lightening time adjustable control module 40, and a rectifier filter output module 50;

[0070] The first input end of the bridge rectifier filter module 10 is connected to the live wire L of the AC power grid, the second input end is connected to the neutral wire N of the AC power grid, and the output end is connected to the first input end of the constant current drive module 20;

[0071] The output end of the constant current driving module 20 is connected to the input end of the rectifying and filtering output module 50, and the output end of the rectifying and filtering output module 50 is connected to the load;

[0072] The first input terminal of the slow start and gradual lightening time adjustable control module 40 is connected to the live wire L of the AC power grid, the second input terminal and the third input terminal are respectively connected to the neutral wire N of the AC power grid, and the output terminal is connected to the second input terminal of the constant current driving module 20;

[0073] The output end of the power adjustment module 30 is connected to the third input end of the constant current driving module 20;

[0074] The bridge rectifier filter module 10 is used to convert an AC signal into a DC signal; the slow start and gradual brightening time adjustable control module 40 is used to collect a power-on signal from the AC signal, and after power-on, outputs a slow start and gradual brightening time adjustable control signal to the constant current drive module 20 according to a preset gradual brightening time and gradual brightening mode; the power adjustment module 30 is used to generate and output a power adjustment signal;

[0075] The constant current driving module 20 is used to adjust the maximum power threshold of the load current according to the power adjustment signal, and to adjust the conduction angle of the internal MOS tube according to the slow-start and gradually-brightening time adjustable control signal, so that the load current changes from zero to a maximum value; the rectifier and filter output module 50 is used to filter the load current and provide the filtered load current to the load.

[0076] Among them, the constant current driving module 20 includes a MOS tube inside, and the load current size is changed by controlling the conduction angle of the MOS. The slow start and gradual lightening time adjustable control signal is preferably a PWM signal. After power-on, the slow start and gradual lightening time adjustable control module 40 outputs a PWM signal according to the preset gradual lightening time and gradual lightening mode; the power adjustment module 30 generates and outputs a power adjustment signal according to the user's settings. When the constant current driving module 20 receives the power adjustment signal, it adjusts the maximum power threshold of the load current, and when receiving the PWM signal, it generates and outputs a load current that changes from zero to the maximum value by changing the conduction angle of the MOS tube inside it. Finally, the rectifier filter output module 50 filters the load current and provides the filtered load current to the load; thereby realizing the slow start of the load, that is, the slow start and gradual lightening change of the LED lamp, effectively solving the problem of drastic brightness changes when the existing LED lighting driver and lamp exist, so that the human eye has a suitable transition period; and the slow start time is adjustable, the load current is adjustable, and it can adapt to different application occasions of LED drivers and lamps.

[0077] In an embodiment of the present invention, the constant current driving module 20 and the slow start and gradual brightening time adjustable control module 40 are relatively independent combinations, wherein the slow start and gradual brightening time adjustable control module 40 can be equipped with an isolated driving module or a non-isolated driving module. The slow start and gradual brightening time adjustable control module 40 can be used for input end detection of the driving module or for output end detection of the driving module. The embodiment of the present invention belongs to the detection application of the input isolation drive of the slow start and gradual brightening time adjustable control module 40 and the constant current driving module 20.

[0078] Optionally, as a preferred embodiment of the present invention, Figure 2 As shown, the slow start and gradual lightening time adjustable control module 40 includes:

[0079] A first diode D1, a second diode D2, a first resistor R1, a mode control chip U1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first voltage zener diode ZD1, a second voltage zener diode ZD2, a first filter capacitor EC1, and a fifth resistor R5;

[0080] The positive electrode of the first diode D1 is connected to the live line L of the AC power grid, and the positive electrode of the second diode D2 is connected to the neutral line N of the AC power grid;

[0081] The cathode of the first diode D1 and the cathode of the second diode D2 are commonly connected to the first end of the first resistor R1;

[0082] The first end of the first resistor R1, the cathode of the first voltage stabilizing diode ZD1, and the anode of the first filter capacitor EC1 are connected to the power supply terminal VCC of the mode control chip U1;

[0083] The anode of the first voltage stabilizing diode ZD1, the anode of the second voltage stabilizing diode ZD2, the cathode of the first filter capacitor EC2 and the GND terminal of the mode control chip U1 are connected to the ground;

[0084] The mode terminal MODEL of the mode control chip U1 is connected to the first end of the second resistor R2;

[0085] The first slow-start time terminal TIME1 of the mode control chip U1 is connected to the first end of the third resistor R3;

[0086] The second slow-start time terminal TIME2 of the mode control chip U1 is connected to the first end of the fourth resistor R4;

[0087] The second end of the second resistor R2, the second end of the third resistor R3, and the second end of the fourth resistor R4 are connected to the ground;

[0088] A first end of the fifth resistor R5 is connected to a zero line N of the AC power grid;

[0089] The second end of the fifth resistor R5 and the cathode of the second voltage stabilizing diode ZD2 are commonly connected to the clock signal terminal CLK of the mode control chip U1;

[0090] The mode control chip U1 includes at least one control signal output terminal.

[0091] Here, the first diode D1, the second diode D2, the first resistor R1, the first voltage regulator diode ZD1, and the first filter capacitor EC1 form a half-wave rectifier filter network for providing a stable voltage signal to the mode control chip U1. The fifth resistor R5 collects the power-on signal of the input switch from the AC signal, generates a clock signal, and provides it to the clock signal terminal CLK of the mode control chip U1. The second voltage regulator diode ZD2 is used as a protection clamp.

[0092] The mode control chip U1 is a slow start and gradual lightening time adjustable control chip, which is used to generate and output a PWM signal according to the resistance signals of the second resistor R2, the third resistor R3, and the fourth resistor R4. Optionally, the mode control chip U1 is preferably EGJL001. Figure 2 As shown, the functions of the mode terminal MODEL, the first slow start time terminal TIME1, and the second slow start time terminal TIME2 of the mode control chip U1 are defined as follows:

[0093] The mode terminal MODEL is used to determine the color cutting mode or the startup gradual brightening mode. The mode terminal MODEL is connected to the second resistor R2. When the second resistor R2 is grounded, the color cutting mode of the LED lamp is determined. Optionally, taking the mode control chip U1 including two control signal output terminals ww and cw as an example, the color cutting mode can be: ww-cw-ww (50%) + cw (50%) - ww cycle. When the second resistor R2 is suspended, the gradual brightening mode of the LED lamp is determined, and the two control signal output terminals ww and cw included in the mode control chip U1 both output PWM signals that slowly change the brightness of the LED lamp from 0 to 100%.

[0094] The first slow start time terminal TIME1 and the second slow start time terminal TIME2 are respectively connected to the third resistor R3 and the fourth resistor R4 to set the duration of the gradual change. In one embodiment, the third resistor R3 and the fourth resistor R4 can be set and fixed before leaving the factory; in another embodiment, the third resistor R3 and the fourth resistor R4 can be respectively connected in series with the dip switch, and the user can adjust the dip switch to set the duration of the gradual change. Optionally, as a preferred example of the present invention:

[0095] When the third resistor R3 is grounded and the fourth resistor R4 is grounded, the corresponding slow start and gradual lightening time is 3S;

[0096] When the third resistor R3 is grounded and the fourth resistor R4 is suspended, the corresponding slow start and gradual lightening time is 5S;

[0097] When the third resistor R3 is suspended and the fourth resistor R4 is grounded, the corresponding slow start and gradual lightening time is 7S;

[0098] When the third resistor R3 is suspended and the fourth resistor R4 is suspended, the corresponding slow start and gradual lightening time is 9S.

[0099] It should be understood that the above slow start and gradual brightening time is only a specific example of the present invention and is not intended to limit the present invention. The slow start and gradual brightening time adjustable control module 40 outputs the slow start and gradual brightening time adjustable control signal to the constant current driving module 20 .

[0100] In the embodiment of the present invention, the constant current driving module 20 is connected to the rectifier filter output module 50 via a first transformer T1A. The first transformer T1A is used as a main power device to realize energy conversion between the input and output sides.

[0101] Alternatively, if Figure 2 As shown, the constant current driving module 20 includes:

[0102] The sixth resistor R6, the first capacitor C1, the seventh resistor R7, the third diode D3, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the third voltage zener diode ZD3, the second capacitor C2, the fourth diode D4, the twelfth resistor R12, the second filter capacitor EC2, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the third capacitor C3, the second transformer T2A, and the constant current drive chip U2;

[0103] The first end of the eighth resistor R8, the first end of the sixth resistor R6, the first end of the first capacitor C1, and the first opposite-name end of the first transformer T1A are connected to the output end of the bridge rectifier filter module 10;

[0104] A common point between the second end of the sixth resistor R6 and the second end of the first capacitor C1 is connected to the first end of the seventh resistor R7, and the second end of the seventh resistor R7 is connected to the cathode of the third diode D3;

[0105] The anode of the third diode D3 and the first same-name terminal of the first transformer T1A are connected to the driving control terminal DRAIN of the constant current driving chip U2;

[0106] The eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are connected in series in sequence;

[0107] One end of the tenth resistor R10, the first end of the eleventh resistor R11, the first end of the second capacitor C2, the positive electrode of the second filter capacitor EC2, the first end of the thirteenth resistor R13, and the cathode of the fourth diode D4 are connected to the power supply terminal VCC of the constant current driving chip U2;

[0108] The cathode of the third voltage stabilizing diode ZD3 and the second end of the eleventh resistor R11 are connected to the control signal terminal PWM of the constant current driving chip U2, and the control signal terminal PWM is used to receive the control signal output by the mode control chip U1;

[0109] The anode of the third voltage stabilizing diode ZD3, the second end of the second capacitor C2, the cathode of the second filter capacitor EC2, and the second end of the thirteenth resistor R13 are connected to the ground;

[0110] The anode of the fourth diode D4 is connected to the first end of the twelfth resistor R12, and the second end of the twelfth resistor R12 is connected to the first end of the fourteenth resistor R14 and the first same-name end of the second transformer T2A respectively;

[0111] The second end of the fourteenth resistor R14, the first end of the third capacitor C3, and the first end of the fifteenth resistor R15 are connected to the feedback voltage input terminal FB of the constant current driving chip;

[0112] The second end of the third capacitor C3, the second end of the fifteenth resistor R15, and the first opposite-name terminal of the second transformer T2A are connected to the ground;

[0113] The current sampling terminal CS of the constant current driving chip U2 is connected to the output terminal of the power adjustment module 30, and the brightness changing terminal DIM is connected to the first terminal of the fourth capacitor C4;

[0114] The second end of the fourth capacitor C4 and the GND end of the constant current driving chip U1 are connected to the ground.

[0115] Here, when the load is an LED lamp, the constant current drive module 20 is an LED constant current drive module. The embodiment of the present invention adopts a constant current drive chip U2 with a primary sideband PWM dimming port, so the constant current drive chip U2 has a constant current dimming function, preferably a model EG6713B chip. The first transformer T1A is a main power device, and the load current output by the constant current drive module 20 is provided to the rectifier filter output module 50 through the first transformer T1A. The eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the second capacitor C2, the second filter capacitor EC2, the fourth diode D4, and the twelfth resistor R12 constitute the power supply network of the constant current drive chip U2, collect electrical signals from the bridge rectifier filter module 10, convert them into electrical signals suitable for the constant current drive chip U2, and provide them to the constant current drive chip U2. The second transformer T2A constitutes the constant current detection network of the constant current drive module 20, and its second same-name end and second opposite-name end are connected to the external constant current detection module.

[0116] The constant current driver chip U2 starts the internal MOS tube after power-on, and adjusts the conduction angle of the MOS tube according to the slow-start and gradually-brightening time adjustable control signal output by the slow-start and gradually-brightening time adjustable control module 40, so that the load current changes from zero to a maximum value, wherein the slow-start and gradually-brightening time adjustable control signal covers the gradual-brightening change mode and the slow-start time, see the description of the above embodiment for details, thereby realizing the slow start of the load, that is, the slow start and gradual-brightening change of the LED lamp, effectively solving the problem of drastic changes in the startup brightness existing in the existing LED lighting drivers and lamps, and the slow-start time is adjustable.

[0117] Alternatively, if Figure 2 As shown, the power adjustment module 30 includes:

[0118] A sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a first switch K1, and a second switch K2;

[0119] A common point between the first end of the eighteenth resistor R18 and the first end of the first switch K1 and the first end of the second switch K2 serves as an output end of the power adjustment module 30;

[0120] The second end of the first switch K1 is connected to the first end of the sixteenth resistor R16;

[0121] The second end of the second switch K2 is connected to the first end of the seventeenth resistor R17;

[0122] The second end of the sixteenth resistor R16, the second end of the seventeenth resistor R17, and the second end of the eighteenth resistor R18 are connected to the ground.

[0123] Here, the first switch K1 and the second switch K2 are respectively connected in series with the sixteenth resistor R16 and the seventeenth resistor R17, which determine the on and off of the parallel branch, and form different resistor parallel networks with the eighteenth resistor R18. In the embodiment of the present invention, the user adjusts the parallel resistance of the sixteenth resistor R16, the seventeenth resistor R17, and the eighteenth resistor R18 by changing the different opening and closing states of the first switch K1 and the second switch K2, and outputs a power adjustment signal, thereby adjusting the detection resistance of the current sampling terminal CS of the constant current drive chip U2, so that the constant current drive chip U2 adjusts the maximum power threshold of the load, outputs load currents of different sizes, and realizes adjustable load current.

[0124] As a preferred example of the present invention, the first switch K1 and the second switch K2 are preferably dip switches. By changing the on and off of the sixteenth resistor R16 and the seventeenth resistor R17 through the dip switches, the user's operation can be greatly facilitated and the user experience can be improved.

[0125] Alternatively, if Figure 2 As shown, the rectification and filtering output module 50 includes:

[0126] a fifth diode D5, a third filter capacitor EC3, and a nineteenth resistor R19;

[0127] The anode of the fifth diode D5 is connected to the second same-name terminal of the first transformer T1A;

[0128] A common point between the cathode of the fifth diode D5, the anode of the third filter capacitor EC3, and the first end of the nineteenth resistor R19 is connected to the anode of the load;

[0129] The second opposite-polarity terminal of the first transformer T1A, the negative electrode of the third filter capacitor EC3, and the second end of the nineteenth resistor R19 are connected to the ground.

[0130] Here, the load current output by the constant current driving module 20 is converted into energy stored in the first transformer T1A, and the fifth diode D5 and the third filter capacitor EC3 constitute a rectifier filter network, which filters the energy released by the first transformer T1A to achieve filtering of the load current, and then provides the filtered load current to the load.

[0131] Optionally, the bridge rectifier filter module 10 includes:

[0132] Bridge rectifier circuit DB1, fourth filter capacitor EC4, fuse F1;

[0133] The first end of the bridge rectifier circuit DB1 is connected to the live wire L of the AC power grid through the fuse F1, and the second end is connected to the neutral wire N of the AC power grid;

[0134] The common point between the third terminal of the bridge rectifier circuit DB1 and the positive electrode of the fourth filter capacitor EC4 serves as the output terminal of the bridge rectifier filter module 10;

[0135] The fourth terminal of the bridge rectifier circuit DB1 and the negative electrode of the fourth filter capacitor EC4 are connected to the ground.

[0136] Here, the bridge rectifier circuit DB1 , the fourth filter capacitor EC4 , and the fuse F1 form a bridge rectifier filter network, which converts the alternating current signal AC at the input end into a direct current signal DC, and then provides it to the constant current drive module 20 .

[0137] Optionally, as a preferred example of the present invention, the load is an LED lamp.

[0138] In summary, the driving circuit provided by the embodiment of the present invention, after power-on startup, the slow-start and gradual-brightening time adjustable control module 40 generates and outputs a slow-start and gradual-brightening time adjustable control signal to control the constant current driving module 20 to work slowly, causing the brightness of the load to change gradually from dark to bright, so that the human eye has an adaptation transition period, and the slow-start time is adjustable; the power adjustment module 30 generates and outputs a power adjustment signal according to the resistance setting to adjust the maximum power threshold of the load current output by the constant current driving module 20, thereby changing the brightness threshold of the load, and realizing the load current adjustment. The power adjustment module 30 uses a dip switch to effectively improve the adaptability of the driving power supply and different power loads.

[0139] The embodiment of the present invention further provides a lamp, comprising the driving circuit as described above. The driving circuit is described in detail in the above embodiment, and will not be described again here.

[0140] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A driving circuit, characterized in that: include: Bridge rectifier filter module, constant current drive module, power adjustment module, slow start and gradual lightening time adjustable control module, rectifier filter output module; The first input end of the bridge rectifier filter module is connected to the live wire of the AC power grid, the second input end is connected to the neutral wire of the AC power grid, and the output end is connected to the first input end of the constant current drive module; The output end of the constant current driving module is connected to the input end of the rectifying and filtering output module, and the output end of the rectifying and filtering output module is connected to the load; The first input end of the slow start and gradual lightening time adjustable control module is connected to the live wire of the AC power grid, the second input end and the third input end are respectively connected to the neutral wire of the AC power grid, and the output end is connected to the second input end of the constant current drive module; The slow start and gradual lightening time adjustable control module comprises: a mode control chip, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; The mode end of the mode control chip is connected to the first end of the second resistor; The first slow-start time terminal of the mode control chip is connected to the first terminal of the third resistor; The second slow-start time terminal of the mode control chip is connected to the first terminal of the fourth resistor; The second end of the second resistor, the second end of the third resistor, and the second end of the fourth resistor are connected to the ground; The first end of the fifth resistor is connected to the zero line of the AC power grid; The second end of the fifth resistor is connected to the clock signal end of the mode control chip; The mode control chip includes at least one control signal output terminal; The output end of the power adjustment module is connected to the third input end of the constant current driving module; The bridge rectifier filter module is used to convert the AC signal into a DC signal; the slow start and gradual brightening time adjustable control module is used to collect the power-on signal from the AC signal, and after power-on, output the slow start and gradual brightening time adjustable control signal to the constant current drive module according to the preset gradual brightening time and gradual brightening mode; the power adjustment module is used to generate and output the power adjustment signal; The constant current driving module is used to adjust the maximum power threshold of the load current according to the power adjustment signal, and to adjust the conduction angle of the internal MOS tube according to the slow-start and gradually-brightening time adjustable control signal, so that the load current gradually changes from zero to the maximum value; the rectifier and filter output module is used to filter the load current and provide the filtered load current to the load.

2. The driving circuit according to claim 1, characterized in that: The slow start and gradual lightening time adjustable control module also includes: A first diode, a second diode, a first resistor, a first voltage zener diode, a second voltage zener diode, and a first filter capacitor; The positive electrode of the first diode is connected to the live wire of the AC power grid, and the positive electrode of the second diode is connected to the neutral wire of the AC power grid; The cathode of the first diode and the cathode of the second diode are commonly connected to the first end of the first resistor; The first end of the first resistor, the cathode of the first voltage stabilizing diode, and the anode of the first filter capacitor are commonly connected to the power supply terminal of the mode control chip; The anode of the first voltage stabilizing diode, the anode of the second voltage stabilizing diode, the cathode of the first filter capacitor and the GND terminal of the mode control chip are connected to the ground; The second end of the fifth resistor and the cathode of the second voltage-stabilizing diode are commonly connected to the clock signal end of the mode control chip.

3. The driving circuit according to claim 2, characterized in that: The constant current driving module is connected to the rectification and filtering output module through a first transformer.

4. The driving circuit according to claim 3, characterized in that: The constant current driving module comprises: A sixth resistor, a first capacitor, a seventh resistor, a third diode, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third voltage-stabilizing diode, a second capacitor, a fourth diode, a twelfth resistor, a second filter capacitor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third capacitor, a second transformer, a constant current drive chip, and a fourth capacitor; The first end of the eighth resistor, the first end of the sixth resistor, the first end of the first capacitor, and the first opposite-name end of the first transformer are commonly connected to the output end of the bridge rectifier and filter module; A common point between the second end of the sixth resistor and the second end of the first capacitor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is connected to the cathode of the third diode; The anode of the third diode and the first same-name terminal of the first transformer are connected to the driving control terminal of the constant current driving chip; The eighth resistor, the ninth resistor and the tenth resistor are connected in series in sequence; One end of the tenth resistor, the first end of the eleventh resistor, the first end of the second capacitor, the positive electrode of the second filter capacitor, the first end of the thirteenth resistor, and the negative electrode of the fourth diode are connected to the power supply end of the constant current drive chip; The cathode of the third voltage stabilizing diode and the second end of the eleventh resistor are connected to the control signal end of the constant current driving chip, and the control signal end is used to receive the control signal output by the mode control chip; The anode of the third voltage stabilizing diode, the second end of the second capacitor, the cathode of the second filter capacitor, and the second end of the thirteenth resistor are connected to the ground; The anode of the fourth diode is connected to the first end of the twelfth resistor, and the second end of the twelfth resistor is connected to the first end of the fourteenth resistor and the first same-name end of the second transformer respectively; The second end of the fourteenth resistor, the first end of the third capacitor, and the first end of the fifteenth resistor are connected to the feedback voltage input end of the constant current driving chip; The second end of the third capacitor, the second end of the fifteenth resistor, and the first opposite-name end of the second transformer are connected to the ground; The current sampling end of the constant current driving chip is connected to the output end of the power adjustment module, and the brightness changing end is connected to the first end of the fourth capacitor; The second end of the fourth capacitor and the GND end of the constant current driving chip are connected to the ground.

5. The driving circuit according to claim 4, characterized in that: The power adjustment module comprises: a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a first switch, and a second switch; A common point between the first end of the eighteenth resistor and the first end of the first switch and the first end of the second switch serves as an output end of the power adjustment module; The second end of the first switch is connected to the first end of the sixteenth resistor; The second end of the second switch is connected to the first end of the seventeenth resistor; The second end of the sixteenth resistor, the second end of the seventeenth resistor, and the second end of the eighteenth resistor are connected to the ground.

6. The driving circuit according to claim 5, characterized in that: The first switch and the second switch are both dip switches.

7. The driving circuit according to claim 4, characterized in that: The rectification and filtering output module comprises: a fifth diode, a third filter capacitor, and a nineteenth resistor; The anode of the fifth diode is connected to the second same-name terminal of the first transformer; A common point between the cathode of the fifth diode, the anode of the third filter capacitor, and the first end of the nineteenth resistor is connected to the anode of the load; The second opposite-name terminal of the first transformer, the negative electrode of the third filter capacitor, and the second end of the nineteenth resistor are connected to the ground.

8. The driving circuit according to any one of claims 1 to 7, characterized in that: The bridge rectifier filter module comprises: Bridge rectifier circuit, fourth filter capacitor, fuse; The first end of the bridge rectifier circuit is connected to the live wire of the AC power grid through a fuse, and the second end is connected to the neutral wire of the AC power grid; The common point between the third end of the bridge rectifier circuit and the positive electrode of the fourth filter capacitor serves as the output end of the bridge rectifier filter module; The fourth terminal of the bridge rectifier circuit and the negative electrode of the fourth filter capacitor are connected to the ground.

9. The driving circuit according to claim 8, characterized in that: The load is an LED lamp.

10. A lamp, characterized in that: The invention comprises a driving circuit as claimed in any one of claims 1 to 9.

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