CN215734953U - Constant-voltage dimming conversion constant-current dimming circuit - Google Patents
Constant-voltage dimming conversion constant-current dimming circuit Download PDFInfo
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- CN215734953U CN215734953U CN202120980918.2U CN202120980918U CN215734953U CN 215734953 U CN215734953 U CN 215734953U CN 202120980918 U CN202120980918 U CN 202120980918U CN 215734953 U CN215734953 U CN 215734953U
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Abstract
The utility model discloses a constant-voltage dimming conversion constant-current dimming circuit which comprises a circuit input end, a high-speed bridge rectifier circuit, a pulse dimming waveform detection circuit, an LC charging and discharging circuit and an LED constant-current dimming output circuit. The circuit can drive a plurality of LED lamps needing constant-current dimming by using one LED constant-voltage dimming power supply, and the circuit has the advantages of low cost and simple wiring.
Description
Technical Field
The utility model relates to the technical field of LED dimming power supplies, in particular to a constant-voltage dimming conversion constant-current dimming circuit.
Background
There are two ways to dim LED lights: constant voltage dimming and constant current dimming; constant voltage is adjusted luminance and is generally arranged in LED lamp area or the lamps and lanterns that adopt LED lamp pearl below 0.5W, and constant current is adjusted luminance and is generally arranged in the lamps and lanterns that adopt lamp pearl more than 0.5W. At present, the constant-current dimming power supply is high in cost and is multipurpose for lamps with high power, and for low-power constant-current lamps with the power below 8W, lamps are mostly not dimmed or a plurality of lamps are connected in series to use a large constant-current dimming power supply, so that inconvenience is brought to light engineering application. The scheme of converting constant voltage dimming into constant current dimming of the circuit enables the low-power dimming constant current lamp to have the advantages of simple wiring and low cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a constant-voltage dimming conversion constant-current dimming circuit which can realize that an LED constant-voltage dimming power supply can simultaneously drive a plurality of LED lamps needing constant-current dimming, does not need an additional dimming interface, has simple wiring and low cost, and solves the problem of difficult constant-current dimming of low-power LED lamps.
In order to achieve the purpose, the utility model provides the following technical scheme: a constant-voltage dimming conversion constant-current dimming circuit comprises a circuit input end, a high-speed bridge rectifier circuit, an LC charging and discharging circuit, an LED constant-current output circuit and a pulse dimming waveform detection circuit. The input end 1 of the circuit is connected with the output end of the constant-voltage dimming power supply, and after passing through a fuse F1, one path of the circuit passes through the high-speed bridge rectifier circuit 2 and the LC charging and discharging circuit 3 to convert the PWM voltage of the constant-voltage dimming power supply into a similar direct-current working voltage required by the LED constant-current dimming output circuit 4; and the other path of the light modulation signal passes through the pulse light modulation waveform detection circuit 5, the PWM signal in the PWM constant-voltage light modulation power supply is converted into a light modulation signal required by the LED constant-current light modulation output circuit 4, and the LED constant-current light modulation output circuit 4 outputs a constant-current light modulation voltage to the LED lamp bead according to the light modulation signal.
Preferably, the circuit input terminal is composed of an input terminal J1, an input terminal J2 and a fuse F1, the terminals J1 and J2 are externally connected with various constant-voltage dimming power supply output terminals, one end of the fuse F1 is connected with a terminal J2, the other end is connected with the anode of the schottky diode D2 and the cathode of the schottky diode D4, and the input terminal J1 is connected with the anode of the schottky diode D3 and the cathode of the schottky diode D5.
Preferably, the high-speed bridge rectifier circuit is formed by connecting schottky diodes D2, D3, D4 and D5, wherein an anode of D2 is connected with a cathode of D4 and then connected to one end of a fuse F1, an anode of D3 is connected with a cathode of D5 and then connected to an input terminal J1, a cathode of D2 is connected with a cathode of D3 and then connected to a positive pole of a power supply voltage labeled VDD, and an anode of D4 is connected with an anode of D5 and then connected to a negative pole of the power supply voltage labeled GND.
Preferably, the LC charging and discharging circuit is formed by connecting an inductor L2, capacitors C1 and C2 in series and parallel, one end of the inductor L2 is connected to a power supply voltage positive electrode VDD, the other end of the inductor L2 is connected to one ends of the capacitors C1 and C2, the capacitors C1 and C2 are connected in parallel, one end of the capacitor L2 is connected, and the other end of the capacitor L2 is connected to a circuit power supply voltage negative electrode, which is marked as GND.
Preferably, the LED constant current dimming output circuit is formed by connecting resistors R1, R2, a schottky diode D1, an inductor L1, a capacitor C3, an LED constant current dimming driving chip U1, output terminals J3, J4, the positive electrode of the LC filtered power supply is labeled as VDD1, one end of the inductor L2 is connected to resistors R1, R2 connected in parallel and 1 pin of the LED constant current dimming driving chip U1, the other ends of the parallel resistors R1 and R2 are connected to the positive electrode of the J3 circuit output terminal, labeled as OUT +, and externally connected to the positive electrode of an LED lamp bead, and also connected to the 8 pin of the LED constant current dimming driving chip U1, the capacitor C3 and the cathode of the schottky diode D1, the 4 pin of the LED constant current dimming driving chip U1 is connected to the anode of the diode D1, one end of the inductor L1, the other end of the inductor L1 is connected to the negative electrode of the J4 circuit output terminal, labeled as OUT-, and externally connected to the negative electrode of the LED lamp bead 1, the constant current dimming driving chip U6, and the rear pin 9, the negative pole of the power supply voltage of the circuit is marked as GND.
Preferably, the pulse dimming waveform detection circuit 5 is composed of fast diodes D9, D10, resistors R3, R4, R5, R6, a zener diode D7 and a capacitor C5, an anode of D9 is connected to an input terminal J1, an anode of D10 is connected to one end of a fuse F1, the D9 is connected to a cathode of D10 and then connected to resistors R5 and R6 in parallel, the other ends of the resistors R5 and R6 in parallel are connected to a cathode of D7 and one end of R3, the other end of R3 is connected to one ends of R4 and C5 and a pin 2 of the LED constant current dimming driving chip U1 and is labeled RDIM, and the other ends of R4 and C5 are connected to a negative pole of a power supply voltage of a connection circuit of the anode of D7 and labeled GND.
Compared with the prior art, the utility model has the following beneficial effects:
the constant-voltage dimming conversion constant-current dimming circuit controls the constant-current dimming lamp through the constant-voltage dimming power supply, does not need an additional dimming interface, and has the advantages of simple wiring and low cost.
Drawings
FIG. 1 is a functional block diagram of the circuit of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
In fig. 1: 1. the input end of the constant voltage regulating constant current circuit; 2. a high-speed bridge rectifier circuit; 3. an LC charge-discharge circuit; 4. the LED constant-current dimming output circuit; 5. pulse dimming waveform detection circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, a constant voltage dimming conversion constant current dimming circuit includes a circuit input terminal 1, a high speed bridge rectifier circuit 2, an LC charging and discharging circuit 3, an LED constant current dimming output circuit 4, and a pulse dimming waveform detection circuit 5. The input end 1 of the circuit is connected with the output end of the constant-voltage dimming power supply, and after passing through a fuse F1, one path of the circuit passes through the high-speed bridge rectifier circuit 2 and the LC charging and discharging circuit 3 to convert the PWM voltage of the constant-voltage dimming power supply into a similar direct-current working voltage required by the LED constant-current dimming output circuit 4; and the other path of the light modulation signal passes through the pulse light modulation waveform detection circuit 5, the PWM signal in the PWM constant-voltage light modulation power supply is converted into a light modulation signal required by the LED constant-current light modulation output circuit 4, and the LED constant-current light modulation output circuit 4 outputs a constant-current light modulation voltage to the LED lamp bead according to the light modulation signal.
As a further scheme of the utility model: the circuit input end 1 is composed of an input terminal J1, an input terminal J2 and a fuse F1, the terminals J1 and J2 are externally connected with various constant-voltage dimming power supply output ends, one end of the fuse F1 is connected with a terminal J2, the other end of the fuse F1 is connected with the anode of a Schottky diode D2 and the cathode of the Schottky diode D4, and an input terminal J1 is connected with the anode of the Schottky diode D3 and the cathode of the Schottky diode D5.
As a further scheme of the utility model: the high-speed bridge rectifier circuit 2 is formed by connecting Schottky diodes D2, D3, D4 and D5, wherein the anode of D2 is connected with the cathode of D4 and then connected to one end of a fuse F1, the anode of D3 is connected with the cathode of D5 and then connected to an input terminal J1, the cathode of D2 is connected with the cathode of D3 and then connected to the positive pole of a power supply voltage marked as VDD, and the anode of D4 is connected with the anode of D5 and then connected to the negative pole of the power supply voltage marked as GND.
As a further scheme of the utility model: the LC charging and discharging circuit 3 is composed of an inductor L2, a capacitor C1 and a capacitor C2 which are connected in series and parallel, one end of the inductor L2 is connected to a power supply voltage positive electrode VDD, the other end of the inductor L2 is connected with one ends of the capacitors C1 and C2, the capacitors C1 and C2 are connected in parallel, one end of the capacitor C1 is connected with the inductor L2, and the other end of the capacitor C85is connected with a circuit power supply voltage negative electrode marked as GND.
As a further scheme of the utility model: the LED constant-current dimming output circuit 4 is formed by connecting resistors R1 and R2, a Schottky diode D1, an inductor L1, a capacitor C3, an LED constant-current dimming driving chip U1 and output terminals J3 and J4, the anode of a power supply after LC filtering is marked as VDD1, one end of an inductor L2 is connected with the resistors R1 and R2 which are connected in parallel and a pin 1 of the LED constant-current dimming driving chip U1, the other end of the parallel resistor R1 and R2 is connected with the positive electrode of the output end of the J3 circuit, which is marked as OUT +, and is connected with the positive electrode of an external LED lamp bead, and is also connected with the pin 8 of the LED constant-current dimming driving chip U1, the cathode of the capacitor C3 and the cathode of the Schottky diode D1, the pin 4 of the LED constant-current dimming driving chip U1 is connected with the anode of the diode D1 and one end of the inductor L1, the other end of the inductor L1 is connected with the negative electrode of the output end of the J4 circuit, which is marked as OUT-, and is connected with the negative electrode of the external LED lamp bead, and the pins 5, 6 and 9 of the LED constant-current dimming driving chip U1 are connected with the negative electrode of the power supply voltage of the circuit and is marked as GND.
As a further scheme of the utility model: the pulse dimming waveform detection circuit 5 comprises fast diodes D9, D10, resistors R3, R4, R5, R6, a voltage stabilizing diode D7 and a capacitor C5, wherein the anode of D9 is connected to an input terminal J1, the anode of D10 is connected to one end of a fuse F1, the D9 is connected with the cathode of D10 and then connected with resistors R5 and R6 which are connected in parallel, the other ends of the resistors R5 and R6 which are connected in parallel are connected with the cathode of D7 and one end of R3, the other end of R3 is connected with one ends of R4 and C5 and a pin 2 (marked as RDIM) of an LED constant-current dimming driving chip U1, and the other ends of R4 and C5 are connected with the anode of D7 and the negative pole of a circuit power supply voltage is marked as GND.
The input terminals J1, J2 of the constant-voltage dimming conversion constant-current dimming circuit are externally connected with various constant-voltage dimming power supply output ends, a power supply with a PWM dimming signal is regulated by a fast rectification circuit consisting of Schottky diodes D2, D3, D4 and D5 and an LC charging and discharging circuit 3 to provide voltage for an LED constant-current output circuit 4, and the other power supply with the PWM dimming signal is used for providing required PWM dimming waveforms for a pin 2 of a constant-current chip U1 after voltage stabilization of over-fast diodes D9, D10 and a voltage stabilizing diode D7 and voltage division of resistors R5 and R6.
The Schottky diodes D2, D3, D4 and D5 and the fast diodes D9 and D10 of the constant-voltage dimming conversion constant-current dimming circuit are applied to realize the isolation of dimming signal input and output and the separation of dimming signal and power supply; the inductor L1 and the capacitors C1 and C2 convert the PWM power supply into a power supply mainly containing direct current as much as possible, the LED constant-current dimming driving chip adopts a constant-current chip U1 with PWM dimming control, and the resistors R3, R4, R5, R6 and the voltage stabilizing diode D7 realize the dimming voltage controlled by the constant-current chip U1.
In summary, the following steps: the constant-voltage dimming conversion constant-current dimming circuit realizes that constant-voltage dimming driving output is converted into constant-current dimming driving output, provides a constant-current dimming driving circuit for an LED lamp needing constant-current dimming, does not need an additional dimming interface, and has the advantages of simple wiring and low cost, thereby effectively solving the problems of high cost and complex wiring of the low-power constant-current dimming lamp at present.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a constant voltage light modulation conversion constant current dimming circuit, includes circuit input (1), high-speed bridge rectifier circuit (2), LC charge-discharge circuit (3), LED constant current dimming output circuit (4), pulse dimming waveform detection circuit (5), its characterized in that: the wiring terminal of the circuit input end (1) is connected with the output end of the constant-voltage dimming power supply, is electrically connected with the input end of the high-speed bridge rectification circuit (2) after passing through a fuse F1, and is connected to the input end of the pulse dimming waveform detection circuit (5); the high-speed bridge rectifier circuit (2) and the LC charge-discharge circuit (3) generate working voltage as the working voltage of the constant-current dimming output circuit (4); the pulse dimming waveform detection circuit (5) extracts a dimming signal for constant-voltage dimming, generates a dimming signal required by the constant-current dimming output circuit and supplies the dimming signal to the LED constant-current dimming output circuit (4), and the LED constant-current dimming output circuit (4) outputs a constant-current dimming voltage according to the dimming signal to drive the LED lamp bead to work.
2. The constant-voltage dimming conversion constant-current dimming circuit according to claim 1, wherein: the circuit input end (1) is composed of an input terminal J1, an input terminal J2 and a fuse F1, the terminals J1 and J2 are externally connected with various constant-voltage dimming power supply output ends, one end of the fuse F1 is connected with a terminal J2, the other end of the fuse F1 is connected with the anode of a Schottky diode D2 and the cathode of the Schottky diode D4, and an input terminal J1 is connected with the anode of the Schottky diode D3 and the cathode of the Schottky diode D5.
3. The constant-voltage dimming conversion constant-current dimming circuit according to claim 1, wherein: the high-speed bridge rectifier circuit (2) is formed by connecting Schottky diodes D2, D3, D4 and D5, wherein the anode of D2 is connected with the cathode of D4 and then connected to one end of a fuse F1, the anode of D3 is connected with the cathode of D5 and then connected to an input terminal J1, the cathode of D2 is connected with the cathode of D3 and then connected to the positive pole of a power supply voltage marked as VDD, and the anode of D4 is connected with the anode of D5 and then connected to the negative pole of the power supply voltage marked as GND.
4. The constant-voltage dimming conversion constant-current dimming circuit according to claim 1, wherein: the LC charging and discharging circuit (3) is formed by connecting an inductor L2, a capacitor C1 and a capacitor C2 in series and parallel, one end of the inductor L2 is connected to a power supply voltage positive electrode VDD, the other end of the inductor L2 is connected with one end of the capacitors C1 and C2, the capacitors C1 and C2 are connected in parallel, one end of the capacitor C1 is connected with the inductor L2, and the other end of the capacitor C85is connected with a circuit power supply voltage negative electrode marked as GND.
5. The constant-voltage dimming conversion constant-current dimming circuit according to claim 1, wherein: the LED constant-current dimming output circuit (4) is formed by connecting resistors R1 and R2, a Schottky diode D1, an inductor L1, a capacitor C3, an LED constant-current dimming driving chip U1 and output terminals J3 and J4, the anode of a power supply after LC filtering is marked as VDD1, one end of an inductor L2 is connected with the resistors R1 and R2 which are connected in parallel and a pin 1 of the LED constant-current dimming driving chip U1, the other end of the parallel resistor R1 and R2 is connected with the positive electrode of the output end of the J3 circuit, which is marked as OUT +, and is connected with the positive electrode of an external LED lamp bead, and is also connected with the pin 8 of the LED constant-current dimming driving chip U1, the cathode of the capacitor C3 and the cathode of the Schottky diode D1, the pin 4 of the LED constant-current dimming driving chip U1 is connected with the anode of the diode D1 and one end of the inductor L1, the other end of the inductor L1 is connected with the negative electrode of the output end of the J4 circuit, which is marked as OUT-, and is connected with the negative electrode of the external LED lamp bead, and the pins 5, 6 and 9 of the LED constant-current dimming driving chip U1 are connected with the negative electrode of the power supply voltage of the circuit and is marked as GND.
6. The constant-voltage dimming conversion constant-current dimming circuit according to claim 1, wherein the pulse dimming waveform detection circuit (5) comprises fast diodes D9, D10, resistors R3, R4, R5, R6, a zener diode D7 and a capacitor C5, the anode of D9 is connected to an input terminal J1, the anode of D10 is connected to one end of a fuse F1, the D9 is connected to the cathode of D10 and then connected to resistors R5 and R6 in parallel, the other ends of resistors R5 and R6 in parallel are connected to the cathode of D7 and one end of R3, the other end of R3 is connected to one end of R4 and C5 and the 2-pin of an LED constant-current dimming driving chip U1 and is labeled RDIM, and the other ends of R4 and C5 are connected to the anode of D7 and are labeled GND.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120980918.2U CN215734953U (en) | 2021-05-10 | 2021-05-10 | Constant-voltage dimming conversion constant-current dimming circuit |
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| CN202120980918.2U CN215734953U (en) | 2021-05-10 | 2021-05-10 | Constant-voltage dimming conversion constant-current dimming circuit |
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| CN215734953U true CN215734953U (en) | 2022-02-01 |
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| CN202120980918.2U Active CN215734953U (en) | 2021-05-10 | 2021-05-10 | Constant-voltage dimming conversion constant-current dimming circuit |
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Effective date of registration: 20230727 Address after: Room 504, Room 503-2, Building 3, Taohui Home Appliance Park, No. 23 Sanle East Road, Shunjiang Community, Beijiao Town, Shunde District, Foshan City, Guangdong Province, 528300 Patentee after: Foshan Mingjia Lighting Electrical Appliances Co.,Ltd. Address before: 510000 floor 3, No. 3-1, erheng Road, Jiangnan Industrial Zone 2, Xingye Avenue, Nancun Town, Panyu District, Guangzhou City, Guangdong Province Patentee before: Guangzhou Mingjia Lighting Equipment Co.,Ltd. |