High-efficiency dimmable LED lighting circuit

Abstract

The utility model discloses a high-efficiency dimmable LED lighting circuit, which comprises a power supply module, a coding module, a logic gate module, a dimming module, an LED lamp module, a nixie tube display module and a key switch. A circuit of the key switch is electrically connected to the coding module and provides a rising edge trigger signal for the coding module. A two-bit coding module is formed by cascading a CMOS double-D trigger, and a generated signal is electrically connected to a logic gate module through a wire, then is connected to a nixie tube display module and a dimming module through a circuit, and finally is electrically connected to an LED lamp module. According to the utility model, the step-down LED constant-current driving chip is adopted as a dimming chip, light adjustment is realized through the same circuit, or control is realized through a switch, so that light is quickly adjusted to brightness expected by a user, and the designed circuit is simple in structure, low in cost, wide in application range, high in practicability and suitable for popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting, in particular to a highly efficient and dimmable LED lighting circuit. Background Art

[0002] In recent years, semiconductor light sources are gradually entering the lighting field as a new type of solid light source. According to the principles of solid light emitting physics, the luminous efficiency can be close to 100%, with the advantages of low operating voltage, low power consumption, short response time, high luminous efficiency, impact resistance, long service life, pure light color, stable and reliable performance and low cost. With the continuous reduction of LED prices and the continuous improvement of luminous brightness, semiconductor light sources have shown a wide range of application prospects in the lighting field.

[0003] LED is considered to be the fourth generation of green light source. It is a solid cold light source with many advantages such as high efficiency, long life, safety and environmental protection, small size, and fast response speed. It has been widely used in urban landscape decoration, traffic signals and commercial advertisements. LED lights have many advantages such as energy saving and high efficiency, and have great development prospects. Its driving and dimming have been the hot topics of research in recent years.

[0004] In the process of realizing the efficient and dimmable LED lighting circuit of the utility model embodiment, the inventor of this patent found at least the following technical problems in the prior art:

[0005] At present, the cost of LED lamp control circuits on the market is relatively high and the dimming efficiency is low. Traditional dimming circuits usually involve using a programmable microcontroller to generate an adjustable PWM rectangular pulse signal to achieve brightness adjustment, which leads to the problems of complex circuits and low dimming efficiency in traditional dimming circuits.

[0006] In summary, traditional dimming circuits have high costs, complex circuits and low dimming efficiency. Utility Model Content

[0007] The embodiment of the utility model provides a highly efficient and dimmable LED lighting circuit, which solves the problems of high cost, complex circuit and low dimming efficiency of traditional dimming circuit.

[0008] An embodiment of the utility model provides an efficient and dimmable LED lighting circuit, comprising a power module, an encoding module, a logic gate module, a dimming module, an LED lamp module, a digital tube display module and a key switch; the key switch is used for adjusting the brightness of the LED lamp, and the key switch is electrically connected to the encoding module to provide a rising edge trigger signal for it; a two-bit encoding module is formed by cascading CMOS dual D flip-flops, and the generated signal is electrically connected to the logic gate module through a wire, and then connected to the digital tube display module and the dimming module through a circuit, and finally electrically connected to the LED lamp module; wherein the dimming chip in the dimming module is specifically a step-down LED constant current driver chip U4.

[0009] Optionally, the buck-type LED constant current driver chip U4 is specifically an XL3002 constant current driver chip.

[0010] Optionally, the power supply module includes: a rectifier unit that converts AC power into DC power, and a voltage stabilizing unit electrically connected to the output end of the rectifier unit; the input end of the voltage stabilizing unit is electrically connected to the input end of the buck LED constant current driver chip U4, and the output end of the voltage stabilizing unit is electrically connected to the encoding module.

[0011] Optionally, the voltage stabilizing chip in the voltage stabilizing unit is specifically a 78L05 type voltage stabilizing chip.

[0012] Optionally, the LED lamp module includes: an electrically connected first current limiting resistor R13 and six direct-plug LED lamp beads, and the six direct-plug LED lamp beads are electrically connected in a three-in-one and two-in-one manner.

[0013] Optionally, the driving unit in the digital display tube module is specifically a switching circuit NPN transistor Q1.

[0014] Optionally, the encoding module includes: a second CMOS dual D flip-flop U1:B and a third CMOS dual D flip-flop U2:A that are electrically connected.

[0015] Optionally, the encoding module further includes: a first CMOS dual D flip-flop U1:A, electrically connected to the second CMOS dual D flip-flop U1:B and the third CMOS dual D flip-flop U2:A.

[0016] Optionally, the CMOS dual D flip-flop is specifically a CD4013 CMOS dual D flip-flop.

[0017] Optionally, the logic gate module includes: a second protection diode D2 and a third protection diode D3 that are electrically connected.

[0018] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0019] The utility model adopts a step-down LED constant current driver chip as a dimming chip, which solves the problem of achieving light adjustment through the same circuit, or controlling through a switch, thereby realizing rapid adjustment of the light to the brightness desired by the user. This design has a simple circuit structure, low cost, a wide range of applications, high practicality, and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a circuit diagram of an efficient and dimmable LED lighting device in one embodiment of the utility model;

[0021] Figure 2 This is a principle block diagram of a high-efficiency and dimmable LED lighting circuit in one embodiment of the utility model;

[0022] In the figure:

[0023] D11- first full-wave rectifier diode;

[0024] D12-second full-wave rectifier diode;

[0025] FU1-slow blow fuse;

[0026] C5-first filter aluminum electrolytic capacitor;

[0027] C6-second filter aluminum electrolytic capacitor;

[0028] U3- positive voltage regulator chip;

[0029] C3-first multilayer ceramic capacitor;

[0030] U4- buck type LED constant current driver chip;

[0031] D4-Schottky diode;

[0032] L1-I-shaped inductor;

[0033] C4-first aluminum electrolytic capacitor;

[0034] D5-The first direct-plug LED lamp bead;

[0035] D6-the second direct-insert LED lamp bead;

[0036] D7-the third direct-insert LED lamp bead;

[0037] D8-the fourth direct-plug LED lamp bead;

[0038] D9-the fifth direct-plug LED lamp bead;

[0039] D10-the sixth direct-insert LED lamp bead;

[0040] R13-first current limiting resistor;

[0041] R14-second current limiting resistor;

[0042] R1 - first pull-down resistor;

[0043] U1: A-first CMOS dual D flip-flop;

[0044] R2 - second pull-down resistor;

[0045] D1-first protection diode;

[0046] C1- the second aluminum electrolytic capacitor;

[0047] C2-second multilayer ceramic capacitor;

[0048] U1: B- second CMOS dual D flip-flop;

[0049] U2: A-third CMOS dual D flip-flop;

[0050] R3 - the third pull-down resistor;

[0051] R4- first voltage dividing resistor;

[0052] R5- the second voltage dividing resistor;

[0053] R6 - pull-up resistor;

[0054] D2-second protection diode;

[0055] D3-the third protection diode;

[0056] Q1-switching circuit NPN transistor;

[0057] R7-the third current limiting resistor;

[0058] R8-the fourth current limiting resistor;

[0059] R9-fifth current limiting resistor;

[0060] R10-sixth current limiting resistor;

[0061] R11-seventh current limiting resistor;

[0062] R12-eighth current limiting resistor;

[0063] K-tact switch;

[0064] cc-common cathode digital tube. DETAILED DESCRIPTION

[0065] The embodiment of the utility model provides a highly efficient and dimmable LED lighting circuit, which solves the problems of high cost, complex circuit and low dimming efficiency of traditional dimming circuit.

[0066] In order to better understand the above-mentioned efficient and dimmable LED lighting circuit, the above-mentioned efficient and dimmable LED lighting circuit will be described in detail below in combination with the drawings and specific implementation methods of the specification. Obviously, the embodiments described in the utility model are part of the embodiments of the utility model, but not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0067] 1. Circuit structure

[0068] Please refer to Figure 1 and Figure 2 The utility model discloses a high-efficiency and dimmable LED lighting circuit, comprising: a power module, an encoding module, a logic gate module, a dimming module, an LED lamp module, a digital tube display module and a key switch.

[0069] The key switch is used to adjust the brightness of the LED lamp. The key switch is electrically connected to the encoding module to provide a rising edge trigger signal for it. Specifically, one end of the touch switch K is connected to the positive terminal of the DC power supply, and the other end is grounded through the first pull-down resistor R1.

[0070] A two-bit encoder module is formed by cascading CMOS dual D flip-flops. The generated signal is electrically connected to a logic gate module through a wire, then connected to a digital tube display module and a dimming module through a circuit, and finally electrically connected to an LED lamp module.

[0071] The dimming chip in the dimming module is specifically a buck-type LED constant current driver chip U4, and the buck-type LED constant current driver chip U4 is electrically connected to the logic gate module.

[0072] Preferably, a XL3002 step-down LED constant current driver chip is used as the dimming chip. In practical applications, other chips with similar functions may be selected, and the present utility model does not limit this.

[0073] The encoding chip in the encoding module is electrically connected to the logic gate module, the key switch is electrically connected to the encoding module, the LED lamp module is electrically connected to the dimming module, and the key switch is electrically connected to the signal output pin of the encoding chip.

[0074] The power supply module includes a rectifier unit that converts AC power into DC power and a voltage stabilizing unit electrically connected to the output end of the rectifier unit; the input end of the voltage stabilizing unit is electrically connected to the input end of the buck LED constant current driver chip U4 in the dimming module, and the output end of the voltage stabilizing unit is electrically connected to the power supply end of the first CMOS dual D flip-flop U1:A in the encoding module.

[0075] The first end of the first filter aluminum electrolytic capacitor C5 is electrically connected to the output end of the rectifier unit, the first filter aluminum electrolytic capacitor C5 is electrically connected to the input end of the positive voltage stabilizing chip U3 in the voltage stabilizing unit, the second end of the first filter aluminum electrolytic capacitor C5 is grounded, the fourth pin of the buck LED constant current driver chip U4 is electrically connected to the first end of the first filter aluminum electrolytic capacitor C5, and the first end of the first filter aluminum electrolytic capacitor C5 is electrically connected to the second pin of the buck LED constant current driver chip U4.

[0076] The GND terminal of the positive voltage stabilizing chip U3 is grounded, the output terminal of the positive voltage stabilizing chip U3 is electrically connected to the first terminal of the second filtering aluminum electrolytic capacitor C6, and the second terminal of the second filtering aluminum electrolytic capacitor C6 is grounded.

[0077] The first end of the first multilayer ceramic capacitor C3 is electrically connected to the second pin and the fourth pin of the buck LED constant current driver chip U4, the first end of the first filter aluminum electrolytic capacitor C5 is electrically connected to the first end of the first multilayer ceramic capacitor C3, and the second end of the first multilayer ceramic capacitor C3 is grounded.

[0078] The first end of the first filtering aluminum electrolytic capacitor C5 is electrically connected to the fourth pin of the buck-type LED constant current driver chip U4 as its power input end.

[0079] The buck-type LED constant current driver chip U4 is a driver chip in the dimming module. The first pin of the buck-type LED constant current driver chip U4 is electrically connected to the cathode of the second protection diode D2 and the cathode of the third protection diode D3 through the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5, respectively. The first pin of the buck-type LED constant current driver chip U4 is also electrically connected to the LED lamp module through the second current-limiting resistor R14. The fifth pin and the sixth pin of the buck-type LED constant current driver chip U4 are electrically connected to the first end of the Schottky diode D4 and the first end of the I-shaped inductor L1, the second end of the Schottky diode D4 is grounded, the second end of the I-shaped inductor L1 is electrically connected to the first end of the first aluminum electrolytic capacitor C4 and the LED lamp module, and the second end of the first aluminum electrolytic capacitor C4 is grounded. The seventh pin and the eighth pin of the buck-type LED constant current driver chip U4 are both grounded.

[0080] The LED lamp module includes a first current limiting resistor R13 and six direct-plug LED lamp beads. The six LED lamp beads are electrically connected in a three-in-one and two-in-one manner, that is, the six direct-plug LED lamp beads are divided into two groups, three in each group are connected in series, and then the two groups are connected in parallel. Among them, the first group includes the first direct-plug LED lamp bead D5, the second direct-plug LED lamp bead D6 and the third direct-plug LED lamp bead D7, and the second group includes the fourth direct-plug LED lamp bead D8, the fifth direct-plug LED lamp bead D9 and the sixth direct-plug LED lamp bead D10.

[0081] The first end of the first current limiting resistor R13 is electrically connected to one end of the second current limiting resistor R14, and the other end of the second current limiting resistor R14 is electrically connected to the CS end (i.e., the first pin) of the buck-type LED constant current driver chip U4. The other end of the second current limiting resistor R14 is electrically connected to the twelfth pin of the second CMOS dual D flip-flop U1:B and the second pin of the third CMOS dual D flip-flop U2:A through the first voltage dividing resistor R4 and the second voltage dividing resistor R5, respectively. The other end of the first voltage dividing resistor R4 and the other end of the second voltage dividing resistor R5 are electrically connected to the cathode of the second protection diode D2 and the cathode of the third protection diode D3 of the logic gate module, respectively.

[0082] The switch circuit NPN transistor Q1 is a bridge connecting the logic module and the digital tube display module. Because the common cathode digital tube cc in the digital tube display module requires relatively large power, the switch circuit NPN transistor Q1 is used as the driving unit of the digital tube display module. The base of the switch circuit NPN transistor Q1 is electrically connected to the anode of the second protection diode D2 of the logic gate module, the anode of the third protection diode D3, and the first end of the pull-up resistor R6; the other end of the pull-up resistor R6 is electrically connected to the positive end of the power supply. The emitter of the switch circuit NPN transistor Q1 is electrically connected to the third current limiting resistor R7, the fourth current limiting resistor R8, and the fifth current limiting resistor R9 in the digital tube display module; the collector of the switch circuit NPN transistor Q1 is connected to the positive end of the power supply.

[0083] The logic gate module includes a second protection diode D2 and a third protection diode D3. The cathode of the second protection diode D2 is electrically connected to the twelfth pin of the second CMOS dual D flip-flop U1:B, and the cathode of the third protection diode D3 is electrically connected to the second pin of the third CMOS dual D flip-flop U2:A.

[0084] The encoding module includes a second CMOS dual D trigger U1:B and a third CMOS dual D trigger U2:A, the ninth pin of the second CMOS dual D trigger U1:B is electrically connected to the third pin of the third CMOS dual D trigger U2:A, the ninth pin of the second CMOS dual D trigger U1:B is electrically connected to the twelfth pin of the second CMOS dual D trigger U1:B, the tenth pin of the second CMOS dual D trigger U1:B is electrically connected to the first end of the second multilayer ceramic capacitor C2, and the tenth pin of the second CMOS dual D trigger U1:B is electrically connected to the first end of the third pull-down resistor R3; the second end of the second multilayer ceramic capacitor C2 is electrically connected to the positive terminal of the power supply, and the second end of the third pull-down resistor R3 is grounded; the fifth pin of the third CMOS dual D trigger U2:A is electrically connected to the second pin of the third CMOS dual D trigger U2:A, and the fourth pin of the third CMOS dual D trigger U2:A is electrically connected to the first end of the third pull-down resistor R3.

[0085] The encoding module also includes a first CMOS dual D trigger U1:A. The eleventh pin of the second CMOS dual D trigger U1:B is electrically connected to the first pin of the first CMOS dual D trigger U1:A. The first pin of the first CMOS dual D trigger U1:A is electrically connected to the first end of the second pull-down resistor R2, the fourth pin of the first CMOS dual D trigger U1:A is electrically connected to the second end of the second pull-down resistor R2, the first end of the second pull-down resistor R2 is electrically connected to the cathode of the diode D1, and the second end of the resistor R2 is electrically connected to the anode of the diode D1. The anode of the diode D1 and the second end of the second pull-down resistor R2 are grounded through the second aluminum electrolytic capacitor C1. The third pin of the first CMOS dual D trigger U1:A is electrically connected to one end of the touch switch K, the other end of the touch switch K is electrically connected to the anode of the power supply, the sixth pin of the first CMOS dual D trigger U1:A is grounded, and the fifth pin of the first CMOS dual D trigger U1:A is connected to the positive pole of the power supply.

[0086] It should be noted that at least one of the first CMOS dual D flip-flop U1:A, the second CMOS dual D flip-flop U1:B, and the third CMOS dual D flip-flop U2:A can be a CD4013 CMOS dual D flip-flop, or other chips with similar functions, which is not limited in the present invention.

[0087] (II) Circuit working condition

[0088] See also Figure 1When the touch switch K is pressed, the touch switch K generates a rising edge, and the rising edge signal is sent to the third pin (clock input end) of the first CMOS dual D flip-flop U1:A. When the clock input end receives the rising edge signal, the first CMOS dual D flip-flop U1:A assigns the level signal of the fifth pin to the first pin (data output end), and the level signal of the second pin is the inversion of the level signal of the first pin. Cascade the CMOS dual D flip-flops to form a two-bit or multi-bit encoding module. Figure 1 Only two-bit encoding examples are given.

[0089] exist Figure 1 In the encoding module shown, the D interface of the front-stage CMOS dual D flip-flop is connected to the CLK interface of the rear-stage CMOS dual D flip-flop, and the R interfaces of the two CMOS dual D flip-flops are connected to the reset circuit, so by pressing the button, the twelfth pin of the second CMOS dual D flip-flop U1:B and the second pin of the third CMOS dual D flip-flop U2:A respectively output 00, 01, 10, and 11. When the output signal is 11, the base of the NPN transistor Q1 of the switching circuit is high level, the collector and emitter of the NPN transistor Q1 of the switching circuit are connected up and down, the digital tube displays "0", and the LED lights are all off. When the output signal is 00, 01, 10, the base of the NPN transistor Q1 of the switching circuit is low level, the NPN transistor Q1 of the switching circuit is not connected up and down at this time, the digital tube displays "L", and the LED light has three corresponding states at this time, namely dim light, medium light, and bright light. The 350mA constant current output LED lamp driving circuit composed of the buck-type LED constant current driver chip U4, the 12~20V DC voltage passes through the full-wave rectifier unit composed of the first full-wave rectifier diode D11 and the second full-wave rectifier diode D12, and then passes through the first filtering aluminum electrolytic capacitor C5 to obtain a smooth DC voltage input to the fourth pin of the buck-type LED constant current driver chip U4; the buck-type LED constant current driver chip U4, Schottky diode D4, I-shaped inductor L1, first aluminum electrolytic capacitor C4 and second current limiting resistor R14 constitute a buck DC / DC conversion unit to generate a stable current output. By changing the resistance of the CS end (i.e. the first pin) of the buck-type LED constant current driver chip U4, the current of the LED lamp module changes, thereby adjusting the brightness of the LED lamp.

[0090] That is to say, every time the touch switch K is triggered, the encoding module will generate different output signals and transmit them to the logic gate module, triggering the logic gate to generate the corresponding conduction state. This series of operations causes the resistance value of the CS terminal (i.e., the first pin) of the buck-type LED constant current driver chip U4 to change, which in turn causes the voltage of the port to change. Finally, the brightness of the LED lamp also changes.

[0091] Considering the user's intuitive indication and monitoring, whenever the LED light is on, "0" is displayed on the digital tube; when the LED light is off, the letter "L" is displayed on the digital tube. Users can directly and clearly understand the working status of the LED light without relying on additional indicator lights or complex display devices. At the same time, adding a slow-blow fuse FU1 to the circuit can provide overload and short-circuit protection. When the current in the circuit exceeds the rated current value of the slow-blow fuse FU1, the slow-blow fuse FU1 will melt and cut off the circuit to prevent overload damage to electronic components or cause fire.

[0092] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A highly efficient and dimmable LED lighting circuit, characterized in that: Including power module, encoding module, logic gate module, dimming module, LED light module, digital tube display module and key switch; The key switch is used to adjust the brightness of the LED lamp, and the key switch is electrically connected to the encoding module to provide a rising edge trigger signal for it; A two-bit encoding module is formed by cascading CMOS dual D flip-flops, and the generated signal is electrically connected to the logic gate module through a wire, and then connected to the digital tube display module and the dimming module through a circuit, and finally electrically connected to the LED lamp module; The dimming chip in the dimming module is specifically a buck-type LED constant current driver chip U4.

2. The circuit according to claim 1, characterized in that The buck-type LED constant current driver chip U4 is specifically an XL3002 constant current driver chip.

3. The circuit according to claim 1, characterized in that The power module comprises: A rectifier unit for converting AC power into DC power, and a voltage stabilizing unit electrically connected to an output end of the rectifier unit; The input end of the voltage stabilizing unit is electrically connected to the input end of the buck-type LED constant current driving chip U4, and the output end of the voltage stabilizing unit is electrically connected to the encoding module.

4. The circuit according to claim 3, characterized in that The voltage stabilizing chip in the voltage stabilizing unit is specifically a 78L05 type voltage stabilizing chip.

5. The circuit according to claim 1, characterized in that The LED lamp module comprises: The electrically connected first current limiting resistor R13 and six direct-plug LED lamp beads are electrically connected in a three-in-one and two-in-one manner.

6. The circuit according to claim 1, characterized in that The driving unit in the digital tube display module is specifically a switch circuit NPN transistor Q1.

7. The circuit according to claim 1, characterized in that The encoding module comprises: The second CMOS dual D flip-flop U1:B and the third CMOS dual D flip-flop U2:A are electrically connected.

8. The circuit according to claim 7, characterized in that The encoding module further includes: The first CMOS dual D flip-flop U1:A is electrically connected to the second CMOS dual D flip-flop U1:B and the third CMOS dual D flip-flop U2:A.

9. The circuit according to claim 1, characterized in that The CMOS dual D flip-flop is specifically a CD4013 CMOS dual D flip-flop.

10. The circuit according to claim 1, characterized in that The logic gate module comprises: The second protection diode D2 and the third protection diode D3 are electrically connected.

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